diff --git a/actions/actiontsc.h b/actions/actiontsc.h
index 1a071bd..3fde8ae 100644
--- a/actions/actiontsc.h
+++ b/actions/actiontsc.h
@@ -24,20 +24,35 @@ template<class D> MString ActionTSC::DoAction(const CLArgs& args, D& ds)
  auto [tindexes, err] = GetTIndexes(ds, args, pars);
  if(err.Exist()) return err;
 
- if(!args.contains("var")) return "Variables not specified";
- auto                 vlist = michlib::Split_on_words(args.at("var"), " ,", false);
+ MString varstring;
+ if(args.contains("var"))
+  varstring = args.at("var");
+ else
+ {
+  if(args.contains("vars"))
+   varstring = args.at("vars");
+  else
+  {
+   if constexpr(HasDefVars<D>)
+    varstring = ds.DefaultVars();
+   else
+    return "Variables not specified";
+  }
+ }
+
+ auto                 vlist = michlib::Split_on_words(varstring, " ,", false);
  std::vector<MString> vnames{std::make_move_iterator(std::begin(vlist)), std::make_move_iterator(std::end(vlist))};
  {
   std::set<MString> used;
   for(const auto& vname: vnames)
   {
-   if(used.contains(vname)) return "Duplicate variable " + vname + " in list " + args.at("var");
+   if(used.contains(vname)) return "Duplicate variable " + vname + " in list " + varstring;
    if(!ds.CheckVar(vname)) return "Variable " + vname + " not exists in this dataset";
    used.insert(vname);
   }
  }
 
- pars.SetParameter("variables", args.at("var"));
+ pars.SetParameter("variables", varstring);
 
  std::unique_ptr<const BaseParameters> sourcepars;
  if constexpr(ParametersSupported<D>)
diff --git a/include/traits.h b/include/traits.h
index f19ae71..0807699 100644
--- a/include/traits.h
+++ b/include/traits.h
@@ -13,6 +13,13 @@ concept InfoSupported = requires(T t) {
  } -> std::convertible_to<MString>;
 };
 
+template<class T>
+concept HasDefVars = requires(T t) {
+ {
+  t.DefaultVars()
+ } -> std::convertible_to<MString>;
+};
+
 template<class T>
 concept ParametersRequiredRegion = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& r) {
  {
diff --git a/sources/MODISBINLOCAL.h b/sources/MODISBINLOCAL.h
index 663647f..e5ed801 100644
--- a/sources/MODISBINLOCAL.h
+++ b/sources/MODISBINLOCAL.h
@@ -43,6 +43,15 @@ class MODISBINLOCALData
  bool    Read(const MString& vname, std::map<MString, Data>& cache, const BaseParameters* ip, size_t tind) const;
  Data    ReadFile(const MString& suf, const struct Parameters* p, size_t tind) const;
 
+ MString DefaultVars() const
+ {
+  if(dataset.size() == 0) return "";
+  if(dataset[0] == "CHL" || dataset[0] == "T_CHL" || dataset[0] == "A_CHL")
+   return "chl";
+  else
+   return "temp";
+ }
+
  std::pair<const BaseParameters*, MString> Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const;
 
  bool CheckVar(const MString& vname) const