diff --git a/tsg_util/updateTsgStructWithCalCoeff.m b/tsg_util/updateTsgStructWithCalCoeff.m
index 09fdeca89b44085d02f86de7f320597a4863ffaa..537cb185f19fdbecc50300c98ccce1c0ef2afb40 100644
--- a/tsg_util/updateTsgStructWithCalCoeff.m
+++ b/tsg_util/updateTsgStructWithCalCoeff.m
@@ -18,12 +18,17 @@ tsg = getappdata( hMainFig, 'tsg_data');
 % -----------------------------
 var = {'SSJT_CALCOEF', 'CNDC_CALCOEF', 'SSTP_CALCOEF'};
 
-% define coefficients names
-% -------------------------
-coeff_type = {{'DATE','A','B','C','D','F0',''},{'DATE','A','B','C','D','M','CPCOR'},...
-  {'DATE','A','B','C','D','F0',''}; ...
-  {'DATE','G','H','I','J','F0',''},{'DATE','G','H','I','J','CTCOR','CPCOR'},...
-  {'DATE','G','H','I','J','F0',''}};
+% define coefficients names, celle array with first element with size
+% COEF_CONV_SIZE
+% -------------------------------------------------------------------
+coeff_type = ...
+  {{padding('DATE',tsg.dim.COEF_CONV_SIZE);'A';'B';'C';'D';'F0';''},...
+   {padding('DATE',tsg.dim.COEF_CONV_SIZE);'A';'B';'C';'D';'M';'CPCOR'},...
+   {padding('DATE',tsg.dim.COEF_CONV_SIZE);'A';'B';'C';'D';'F0';''}; ...
+   {padding('DATE',tsg.dim.COEF_CONV_SIZE);'G';'H';'I';'J';'F0';''},...
+   {padding('DATE',tsg.dim.COEF_CONV_SIZE);'G';'H';'I';'J';'CTCOR';'CPCOR'},...
+   {padding('DATE',tsg.dim.COEF_CONV_SIZE);'G';'H';'I';'J';'F0';''}
+  };
 
 % get preference choice for cabrations type popup
 % -----------------------------------------------
@@ -36,17 +41,16 @@ for i = 1:numel(var)
     tsg.([var{i} '_CONV']) = [];
     for j = 1:tsg.dim.CALCOEF
       tsg.(var{i})(j) = NaN;
-      tsg.([var{i} '_CONV']) = ...
-        [tsg.([var{i} '_CONV']); padding(coeff_type{pref,i}{j}, tsg.dim.COEF_CONV_SIZE)];
     end
   elseif isnan(tsg.(var{i})) 
     tsg.([var{i} '_CONV']) = [];
     for j = 1:tsg.dim.CALCOEF
       tsg.(var{i})(j) = NaN;
-      tsg.([var{i} '_CONV']) = ...
-        [tsg.([var{i} '_CONV']); padding(coeff_type{pref,i}{j}, tsg.dim.COEF_CONV_SIZE)];
     end
   end
+  % convert cell array of string to char array
+  % ------------------------------------------
+  tsg.([var{i} '_CONV']) = char(coeff_type{pref,i});
 end
 
 % Save tsg structure