add channels to halpha

git-svn-id: https://spcsvn.epfl.ch/repos/TCV/gdat/trunk@7467 d63d8f72-b253-0410-a779-e742ad2e26cf

crpptbx/TCV/gdat_tcv.m

@@ -808,6 +808,13 @@ elseif strcmp(mapping_for_tcv.method,'switchcase')
     gdat_data.request_description = ['data=psi, x=(R,Z), eqdsk contains eqdsk structure with which ' ...
                     'plot_eqdsk, write_eqdsk, read_eqdsk can be used'];
     
+    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+   case {'halpha'}
+    channels = -1;
+    if isfield(gdat_data.gdat_params,'channels') && ~isempty(gdat_data.gdat_params.channels)
+      channels = gdat_data.gdat_params.channels;
+    end
+
     %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    case {'mhd'}
     % load n=1, 2 and 3 Bdot from magnetic measurements