diff --git a/actions/actiongenintfile.h b/actions/actiongenintfile.h
index 5ccd9a1..7b04a21 100644
--- a/actions/actiongenintfile.h
+++ b/actions/actiongenintfile.h
@@ -11,6 +11,9 @@ ADD_ACTION(GenIntFile, genintfile, ReadIsGrid<Source>);
 
 template<class D> MString ActionGenIntFile::DoAction(const CLArgs& args, D& ds)
 {
+ auto [reg, regerr] = GetRegion<D>(args);
+ if(regerr.Exist()) return regerr;
+
  auto resop = ds.Open(args);
  if(resop.Exist()) return "Can't open source: " + resop;
 
@@ -30,9 +33,18 @@ template<class D> MString ActionGenIntFile::DoAction(const CLArgs& args, D& ds)
  std::unique_ptr<const BaseParameters> sourcepars;
  if constexpr(ParametersSupported<D>)
  {
-  auto [p, err] = ds.Parameters(pars, args);
-  if(err.Exist()) return err;
-  sourcepars.reset(p);
+  if constexpr(ParametersRequiredRegion<D>)
+  {
+   auto [p, err] = ds.Parameters(pars, args, reg);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
+  else
+  {
+   auto [p, err] = ds.Parameters(pars, args);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
  }
  auto p = sourcepars.get();
 
diff --git a/actions/actiontsc.h b/actions/actiontsc.h
index 6e45c8b..1bf97f3 100644
--- a/actions/actiontsc.h
+++ b/actions/actiontsc.h
@@ -9,6 +9,9 @@ ADD_ACTION(TSC, tsc, ReadPSupported<Source> || ReadSupported<Source>);
 
 template<class D> MString ActionTSC::DoAction(const CLArgs& args, D& ds)
 {
+ auto [reg, regerr] = GetRegion<D>(args);
+ if(regerr.Exist()) return regerr;
+
  auto resop = ds.Open(args);
  if(resop.Exist()) return "Can't open source: " + resop;
 
@@ -27,9 +30,18 @@ template<class D> MString ActionTSC::DoAction(const CLArgs& args, D& ds)
  std::unique_ptr<const BaseParameters> sourcepars;
  if constexpr(ParametersSupported<D>)
  {
-  auto [p, err] = ds.Parameters(pars, args);
-  if(err.Exist()) return err;
-  sourcepars.reset(p);
+  if constexpr(ParametersRequiredRegion<D>)
+  {
+   auto [p, err] = ds.Parameters(pars, args, reg);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
+  else
+  {
+   auto [p, err] = ds.Parameters(pars, args);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
  }
  auto p = sourcepars.get();
 
diff --git a/actions/actionuv.h b/actions/actionuv.h
index 883a6ff..da64ebf 100644
--- a/actions/actionuv.h
+++ b/actions/actionuv.h
@@ -9,6 +9,9 @@ ADD_ACTION(UV, uv, ReadPSupported<Source> || ReadSupported<Source>);
 
 template<class D> MString ActionUV::DoAction(const CLArgs& args, D& ds)
 {
+ auto [reg, regerr] = GetRegion<D>(args);
+ if(regerr.Exist()) return regerr;
+
  auto resop = ds.Open(args);
  if(resop.Exist()) return "Can't open source: " + resop;
 
@@ -22,9 +25,18 @@ template<class D> MString ActionUV::DoAction(const CLArgs& args, D& ds)
  std::unique_ptr<const BaseParameters> sourcepars;
  if constexpr(ParametersSupported<D>)
  {
-  auto [p, err] = ds.Parameters(pars, args);
-  if(err.Exist()) return err;
-  sourcepars.reset(p);
+  if constexpr(ParametersRequiredRegion<D>)
+  {
+   auto [p, err] = ds.Parameters(pars, args, reg);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
+  else
+  {
+   auto [p, err] = ds.Parameters(pars, args);
+   if(err.Exist()) return err;
+   sourcepars.reset(p);
+  }
  }
  auto p = sourcepars.get();
 
diff --git a/include/actiondep.h b/include/actiondep.h
index 7caf65b..4f2a8cc 100644
--- a/include/actiondep.h
+++ b/include/actiondep.h
@@ -1,6 +1,12 @@
 #pragma once
 #include "ParseArgs.h"
+#include "basedata.h"
+#include "mdatetime.h"
+#include "mregex.h"
 #include "traits.h"
+#include "uvdata.h"
+
+using michlib::MDateTime;
 
 #if defined GENACTIONLIST
 #define ADD_ACTION(actclass, actname, suptest) ADD ACTION CLASS: actclass
@@ -14,3 +20,197 @@
   template<class Source> static MString        DoAction(const CLArgs& args, Source& data);                                                                                         \
  };
 #endif
+
+template<class D> size_t GetTIndex(const D& data, const MDateTime& t)
+{
+ size_t nt = data.NTimes();
+
+ if(t <= data.Time(0)) return 0;
+ if(t >= data.Time(nt - 1)) return nt - 1;
+ for(size_t i = 0; i < nt - 1; i++)
+  if(t >= data.Time(i) && t <= data.Time(i + 1)) return (t - data.Time(i) <= data.Time(i + 1) - t) ? i : (i + 1);
+ return 0;
+}
+
+template<class D> std::pair<TIndex, MString> GetTIndexes(const D& data, const CLArgs& args, michlib_internal::ParameterListEx& pars)
+{
+ TIndex tindexes;
+
+ if(args.contains("time") && (args.contains("timeb") || args.contains("timee")))
+  return {tindexes, "Time must be set via time parameter or timeb and timee parameter but not via both"};
+ if(!(args.contains("time") || (args.contains("timeb") && args.contains("timee")))) return {tindexes, "Time must be set via time parameter or timeb and timee parameter"};
+
+ if(args.contains("time"))
+ {
+  MString   regex = args.at("time");
+  MDateTime time;
+
+  if(time.FromString(regex)) return {TIndex(1, GetTIndex(data, time)), ""};             // Time, not regex
+  if(regex == "BEGIN" || regex == "BEG" || regex == "FIRST") return {TIndex(1, 0), ""}; // First time
+  if(regex == "END" || regex == "LAST") return {TIndex(1, data.NTimes() - 1), ""};      // Last time
+
+  michlib::RegExpSimple reg(regex.Buf());
+  if(reg.Compile() != 0) return {tindexes, "Bad regular expression: " + regex};
+
+  for(size_t i = 0; i < data.NTimes(); i++)
+  {
+   MString date = data.Time(i).ToString();
+   if(reg.Match(date.Buf())) tindexes.push_back(i);
+  }
+  if(tindexes.size() == 0) return {tindexes, "There are no times matching the regular expression: " + regex};
+  if(tindexes.size() == 1)
+   pars.SetParameter("time", data.Time(tindexes[0]).ToString());
+  else
+   pars.SetParameter("timeregex", args.at("time"));
+ }
+ else
+ {
+  MString   tb = args.at("timeb");
+  MString   te = args.at("timee");
+  MDateTime b(tb), e(te);
+
+  auto nt = data.NTimes();
+  if(tb == "BEGIN" || tb == "BEG") b = data.Time(0);
+  if(te == "LAST" || te == "END") e = data.Time(nt - 1);
+
+  const MDateTime& beg = (b < e) ? b : e;
+  const MDateTime& end = (b > e) ? b : e;
+
+  if(beg > data.Time(nt - 1)) return {tindexes, "Begin time " + b.ToTString() + " is greater then end time in the dataset " + data.Time(nt - 1).ToTString()};
+  if(end < data.Time(0)) return {tindexes, "End time " + e.ToTString() + " is lesser then begin time in the dataset " + data.Time(0).ToTString()};
+
+  size_t ib = 0, ie = nt - 1;
+  for(size_t i = 0; i < nt; i++)
+   if(data.Time(i) >= beg)
+   {
+    ib = i;
+    break;
+   }
+
+  for(size_t i = nt; i != 0; i--)
+   if(data.Time(i - 1) <= end)
+   {
+    ie = i - 1;
+    break;
+   }
+
+  tindexes.resize(ie - ib + 1);
+  for(size_t i = 0; i < ie - ib + 1; i++) tindexes[i] = i + ib;
+
+  if(tindexes.size() == 0) return {tindexes, "There are no times between " + b.ToString() + " and " + e.ToString()};
+  pars.SetParameter("timeb", b.ToString());
+  pars.SetParameter("timee", e.ToString());
+ }
+
+ return {tindexes, ""};
+}
+
+template<class D> ReadType<D> Read(const D& data, const MString& vname, const BaseParameters* p, const TIndex& tindex)
+{
+ using RT = ReadType<D>;
+ size_t ind;
+ if(tindex.size() == 1)
+ {
+  ind = tindex[0];
+  michlib::message("Time: " + data.Time(ind).ToTString());
+  if constexpr(ReadPSupported<D>)
+   return data.Read(vname, p, ind);
+  else if constexpr(ReadSupported<D>)
+   return data.Read(vname, ind);
+ }
+ else
+ {
+  Averager<RT> out;
+  bool         ok = true;
+  for(size_t i = 0; i < tindex.size(); i++)
+  {
+   if(!ok) break;
+   ind = tindex[i];
+   michlib::message("Time: " + data.Time(ind).ToTString());
+   RT dat;
+   if constexpr(ReadPSupported<D>)
+    dat = data.Read(vname, p, ind);
+   else if constexpr(ReadSupported<D>)
+    dat = data.Read(vname, ind);
+   if(dat)
+    out.Add(dat);
+   else
+    ok = false;
+  }
+  if(ok) return out.Div();
+ }
+ return RT();
+}
+
+template<class D> UVData<ReadType<D>> ReadUV(const D& data, const BaseParameters* p, size_t ind)
+{
+ using RT = ReadType<D>;
+ using UV = UVData<RT>;
+ michlib::message("Time: " + data.Time(ind).ToTString());
+ RT u, v;
+ if constexpr(ReadPSupported<D>)
+ {
+  u = data.Read("u", p, ind);
+  v = data.Read("v", p, ind);
+ }
+ else if constexpr(ReadSupported<D>)
+ {
+  u = data.Read("u", ind);
+  v = data.Read("v", ind);
+ }
+ return UV(u, v);
+}
+
+template<class D> UVData<ReadType<D>> ReadUV(const D& data, const BaseParameters* p, const TIndex& tindex)
+{
+ using RT = ReadType<D>;
+ using UV = UVData<RT>;
+
+ if(tindex.size() == 1)
+  return ReadUV(data, p, tindex[0]);
+ else
+ {
+  Averager<UV> out;
+  bool         ok = true;
+  size_t       ind;
+  for(size_t i = 0; i < tindex.size(); i++)
+  {
+   if(!ok) break;
+   ind = tindex[i];
+   michlib::message("Time: " + data.Time(ind).ToTString());
+   RT u, v;
+   if constexpr(ReadPSupported<D>)
+   {
+    u = data.Read("u", p, ind);
+    v = data.Read("v", p, ind);
+   }
+   else if constexpr(ReadSupported<D>)
+   {
+    u = data.Read("u", ind);
+    v = data.Read("v", ind);
+   }
+   UV dat(u, v);
+   if(dat)
+    out.Add(dat);
+   else
+    ok = false;
+  }
+  if(ok) return out.Div();
+ }
+ return UV();
+}
+
+template<class D> std::pair<struct Region, MString> GetRegion(const CLArgs& args)
+{
+ struct Region reg;
+ if constexpr(!ParametersRequiredRegion<D>) return {reg, ""};
+ if(!(args.contains("lonb") && args.contains("lone") && args.contains("latb") && args.contains("late"))) return {reg, "Region not specified (lonb, lone, latb, late)"};
+ reg.lonb  = args.at("lonb").ToReal();
+ reg.lone  = args.at("lone").ToReal();
+ real latb = args.at("latb").ToReal();
+ real late = args.at("late").ToReal();
+ reg.latb  = std::min(latb, late);
+ reg.late  = std::max(latb, late);
+
+ return {reg, ""};
+}
diff --git a/include/actions.h b/include/actions.h
index be59a80..9653596 100644
--- a/include/actions.h
+++ b/include/actions.h
@@ -1,13 +1,7 @@
 #pragma once
 #include "actionlist.h"
-#include "basedata.h"
-#include "mdatetime.h"
-#include "mregex.h"
-#include "uvdata.h"
 #include "varhelpers.h"
 
-using michlib::MDateTime;
-
 using ActionVariants = std::variant<ACTLIST>;
 
 class Action: public ActionVariants
@@ -23,182 +17,3 @@ class Action: public ActionVariants
   return "";
  }
 };
-
-template<class D> size_t GetTIndex(const D& data, const MDateTime& t)
-{
- size_t nt = data.NTimes();
-
- if(t <= data.Time(0)) return 0;
- if(t >= data.Time(nt - 1)) return nt - 1;
- for(size_t i = 0; i < nt - 1; i++)
-  if(t >= data.Time(i) && t <= data.Time(i + 1)) return (t - data.Time(i) <= data.Time(i + 1) - t) ? i : (i + 1);
- return 0;
-}
-
-template<class D> std::pair<TIndex, MString> GetTIndexes(const D& data, const CLArgs& args, michlib_internal::ParameterListEx& pars)
-{
- TIndex tindexes;
-
- if(args.contains("time") && (args.contains("timeb") || args.contains("timee")))
-  return {tindexes, "Time must be set via time parameter or timeb and timee parameter but not via both"};
- if(!(args.contains("time") || (args.contains("timeb") && args.contains("timee")))) return {tindexes, "Time must be set via time parameter or timeb and timee parameter"};
-
- if(args.contains("time"))
- {
-  MString   regex = args.at("time");
-  MDateTime time;
-
-  if(time.FromString(regex)) return {TIndex(1, GetTIndex(data, time)), ""};             // Time, not regex
-  if(regex == "BEGIN" || regex == "BEG" || regex == "FIRST") return {TIndex(1, 0), ""}; // First time
-  if(regex == "END" || regex == "LAST") return {TIndex(1, data.NTimes() - 1), ""};      // Last time
-
-  michlib::RegExpSimple reg(regex.Buf());
-  if(reg.Compile() != 0) return {tindexes, "Bad regular expression: " + regex};
-
-  for(size_t i = 0; i < data.NTimes(); i++)
-  {
-   MString date = data.Time(i).ToString();
-   if(reg.Match(date.Buf())) tindexes.push_back(i);
-  }
-  if(tindexes.size() == 0) return {tindexes, "There are no times matching the regular expression: " + regex};
-  if(tindexes.size() == 1)
-   pars.SetParameter("time", data.Time(tindexes[0]).ToString());
-  else
-   pars.SetParameter("timeregex", args.at("time"));
- }
- else
- {
-  MString   tb = args.at("timeb");
-  MString   te = args.at("timee");
-  MDateTime b(tb), e(te);
-
-  auto nt = data.NTimes();
-  if(tb == "BEGIN" || tb == "BEG") b = data.Time(0);
-  if(te == "LAST" || te == "END") e = data.Time(nt - 1);
-
-  const MDateTime& beg = (b < e) ? b : e;
-  const MDateTime& end = (b > e) ? b : e;
-
-  if(beg > data.Time(nt - 1)) return {tindexes, "Begin time " + b.ToTString() + " is greater then end time in the dataset " + data.Time(nt - 1).ToTString()};
-  if(end < data.Time(0)) return {tindexes, "End time " + e.ToTString() + " is lesser then begin time in the dataset " + data.Time(0).ToTString()};
-
-  size_t ib = 0, ie = nt - 1;
-  for(size_t i = 0; i < nt; i++)
-   if(data.Time(i) >= beg)
-   {
-    ib = i;
-    break;
-   }
-
-  for(size_t i = nt; i != 0; i--)
-   if(data.Time(i - 1) <= end)
-   {
-    ie = i - 1;
-    break;
-   }
-
-  tindexes.resize(ie - ib + 1);
-  for(size_t i = 0; i < ie - ib + 1; i++) tindexes[i] = i + ib;
-
-  if(tindexes.size() == 0) return {tindexes, "There are no times between " + b.ToString() + " and " + e.ToString()};
-  pars.SetParameter("timeb", b.ToString());
-  pars.SetParameter("timee", e.ToString());
- }
-
- return {tindexes, ""};
-}
-
-template<class D> ReadType<D> Read(const D& data, const MString& vname, const BaseParameters* p, const TIndex& tindex)
-{
- using RT = ReadType<D>;
- size_t ind;
- if(tindex.size() == 1)
- {
-  ind = tindex[0];
-  michlib::message("Time: " + data.Time(ind).ToTString());
-  if constexpr(ReadPSupported<D>)
-   return data.Read(vname, p, ind);
-  else if constexpr(ReadSupported<D>)
-   return data.Read(vname, ind);
- }
- else
- {
-  Averager<RT> out;
-  bool         ok = true;
-  for(size_t i = 0; i < tindex.size(); i++)
-  {
-   if(!ok) break;
-   ind = tindex[i];
-   michlib::message("Time: " + data.Time(ind).ToTString());
-   RT dat;
-   if constexpr(ReadPSupported<D>)
-    dat = data.Read(vname, p, ind);
-   else if constexpr(ReadSupported<D>)
-    dat = data.Read(vname, ind);
-   if(dat)
-    out.Add(dat);
-   else
-    ok = false;
-  }
-  if(ok) return out.Div();
- }
- return RT();
-}
-
-template<class D> UVData<ReadType<D>> ReadUV(const D& data, const BaseParameters* p, size_t ind)
-{
- using RT = ReadType<D>;
- using UV = UVData<RT>;
- michlib::message("Time: " + data.Time(ind).ToTString());
- RT u, v;
- if constexpr(ReadPSupported<D>)
- {
-  u = data.Read("u", p, ind);
-  v = data.Read("v", p, ind);
- }
- else if constexpr(ReadSupported<D>)
- {
-  u = data.Read("u", ind);
-  v = data.Read("v", ind);
- }
- return UV(u, v);
-}
-
-template<class D> UVData<ReadType<D>> ReadUV(const D& data, const BaseParameters* p, const TIndex& tindex)
-{
- using RT = ReadType<D>;
- using UV = UVData<RT>;
-
- if(tindex.size() == 1)
-  return ReadUV(data, p, tindex[0]);
- else
- {
-  Averager<UV> out;
-  bool         ok = true;
-  size_t       ind;
-  for(size_t i = 0; i < tindex.size(); i++)
-  {
-   if(!ok) break;
-   ind = tindex[i];
-   michlib::message("Time: " + data.Time(ind).ToTString());
-   RT u, v;
-   if constexpr(ReadPSupported<D>)
-   {
-    u = data.Read("u", p, ind);
-    v = data.Read("v", p, ind);
-   }
-   else if constexpr(ReadSupported<D>)
-   {
-    u = data.Read("u", ind);
-    v = data.Read("v", ind);
-   }
-   UV dat(u, v);
-   if(dat)
-    out.Add(dat);
-   else
-    ok = false;
-  }
-  if(ok) return out.Div();
- }
- return UV();
-}
diff --git a/include/basedata.h b/include/basedata.h
index c78c574..f1544cf 100644
--- a/include/basedata.h
+++ b/include/basedata.h
@@ -10,6 +10,11 @@ class BaseParameters
  virtual ~BaseParameters();
 };
 
+struct Region
+{
+ real lonb, lone, latb, late;
+};
+
 class BaseData
 {
  protected:
diff --git a/include/layereddata.h b/include/layereddata.h
index 72e795a..c88e272 100644
--- a/include/layereddata.h
+++ b/include/layereddata.h
@@ -133,7 +133,7 @@ class LayeredData: public NCFuncs
  public:
  MString Info() const;
 
- std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const;
+ std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const;
 
  Data Read(const MString& vname, const BaseParameters* ip, size_t i) const;
 
diff --git a/include/traits.h b/include/traits.h
index d4640aa..29271fa 100644
--- a/include/traits.h
+++ b/include/traits.h
@@ -13,12 +13,22 @@ concept InfoSupported = requires(T t) {
 };
 
 template<class T>
-concept ParametersSupported = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args) {
+concept ParametersRequiredRegion = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& r) {
+ {
+  t.Parameters(pars, args, r).first
+ } -> std::convertible_to<const BaseParameters*>;
+};
+
+template<class T>
+concept ParametersNotRequiredRegion = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args) {
  {
   t.Parameters(pars, args).first
  } -> std::convertible_to<const BaseParameters*>;
 };
 
+template<class T>
+concept ParametersSupported = ParametersRequiredRegion<T> || ParametersNotRequiredRegion<T>;
+
 template<class T>
 concept ReadPSupported = requires(T t, const MString& vname, const BaseParameters* ip, size_t i) {
  {
diff --git a/sources/AVISOLOCAL.cpp b/sources/AVISOLOCAL.cpp
index 14b35dc..79e6f7c 100644
--- a/sources/AVISOLOCAL.cpp
+++ b/sources/AVISOLOCAL.cpp
@@ -70,14 +70,13 @@ MString AVISOLOCALData::Open(const CLArgs& args)
  return "";
 }
 
-std::pair<const BaseParameters*, MString> AVISOLOCALData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const
+std::pair<const BaseParameters*, MString> AVISOLOCALData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const
 {
  std::unique_ptr<struct Parameters> ppar{new struct Parameters};
- if(!(args.contains("lonb") && args.contains("lone") && args.contains("latb") && args.contains("late"))) return {nullptr, "Region not specified (lonb, lone, latb, late)"};
- ppar->lonb = args.at("lonb").ToReal();
- ppar->lone = args.at("lone").ToReal();
- ppar->latb = args.at("latb").ToReal();
- ppar->late = args.at("late").ToReal();
+ ppar->lonb = reg.lonb;
+ ppar->lone = reg.lone;
+ ppar->latb = reg.latb;
+ ppar->late = reg.late;
 
  pars.SetParameter("lonb", ppar->lonb);
  pars.SetParameter("latb", ppar->latb);
diff --git a/sources/AVISOLOCAL.h b/sources/AVISOLOCAL.h
index 2978b17..1365d28 100644
--- a/sources/AVISOLOCAL.h
+++ b/sources/AVISOLOCAL.h
@@ -37,7 +37,7 @@ class AVISOLOCALData: public NCFuncs
  // TODO: RetVal
  MString Open(const CLArgs& args);
 
- std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const;
+ std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const;
 
  bool isOk() const { return times.size() > 0; }
 
diff --git a/sources/MODISBINLOCAL.cpp b/sources/MODISBINLOCAL.cpp
index bad3d64..a6e5f60 100644
--- a/sources/MODISBINLOCAL.cpp
+++ b/sources/MODISBINLOCAL.cpp
@@ -66,14 +66,14 @@ MString MODISBINLOCALData::Open(const CLArgs& args)
  return "";
 }
 
-std::pair<const BaseParameters*, MString> MODISBINLOCALData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const
+std::pair<const BaseParameters*, MString> MODISBINLOCALData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const
 {
  std::unique_ptr<struct Parameters> ppar{new struct Parameters};
- if(!(args.contains("lonb") && args.contains("lone") && args.contains("latb") && args.contains("late"))) return {nullptr, "Region not specified (lonb, lone, latb, late)"};
- ppar->lonb = args.at("lonb").ToReal();
- ppar->lone = args.at("lone").ToReal();
- ppar->latb = args.at("latb").ToReal();
- ppar->late = args.at("late").ToReal();
+
+ ppar->lonb = reg.lonb;
+ ppar->lone = reg.lone;
+ ppar->latb = reg.latb;
+ ppar->late = reg.late;
 
  pars.SetParameter("lonb", ppar->lonb);
  pars.SetParameter("latb", ppar->latb);
diff --git a/sources/MODISBINLOCAL.h b/sources/MODISBINLOCAL.h
index 88fb4f4..b6348f8 100644
--- a/sources/MODISBINLOCAL.h
+++ b/sources/MODISBINLOCAL.h
@@ -43,7 +43,7 @@ class MODISBINLOCALData
  Data    Read(const MString& var, const BaseParameters* ip, size_t tind) const;
  Data    ReadFile(const MString& suf, const struct Parameters* p, size_t tind) const;
 
- std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const;
+ std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const;
 
  bool CheckVar(const MString& vname) const
  {
diff --git a/src/layereddata.cpp b/src/layereddata.cpp
index bfc646c..1ddfc28 100644
--- a/src/layereddata.cpp
+++ b/src/layereddata.cpp
@@ -125,7 +125,7 @@ MString LayeredData::Open(const MString& dataset)
  return "";
 }
 
-std::pair<const BaseParameters*, MString> LayeredData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args) const
+std::pair<const BaseParameters*, MString> LayeredData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const
 {
  std::unique_ptr<struct Parameters> ppar{new struct Parameters};
 
@@ -133,14 +133,12 @@ std::pair<const BaseParameters*, MString> LayeredData::Parameters(michlib_intern
  if(!args.contains("depth") && ppar->layer >= NDepths()) return {nullptr, MString("Layer ") + ppar->layer + " is too deep!"};
  real depth = args.contains("depth") ? args.at("depth").ToReal() : Depth(ppar->layer);
 
- if(!(args.contains("lonb") && args.contains("lone") && args.contains("latb") && args.contains("late"))) return {nullptr, "Region not specified (lonb, lone, latb, late)"};
-
  {
   auto dom  = DetGeoDomain(lonb, lone);
-  real lon1 = ToGeoDomain(args.at("lonb").ToReal(), dom);
-  real lon2 = ToGeoDomain(args.at("lone").ToReal(), dom);
-  real lat1 = args.at("latb").ToReal();
-  real lat2 = args.at("late").ToReal();
+  real lon1 = ToGeoDomain(reg.lonb, dom);
+  real lon2 = ToGeoDomain(reg.lone, dom);
+  real lat1 = reg.latb;
+  real lat2 = reg.late;
 
   // Special case when the longitude lies in a small sector between the end and the start
   if(lon1 < lonb) lon1 = lone;