diff --git a/crpptbx/TCV/gdat_tcv.m b/crpptbx/TCV/gdat_tcv.m
index a413e5ec5a848a0e895d29a16745e7f7d58324fb..555bff0a1cbb434e10ee2d139d5f886ee307b6c3 100644
--- a/crpptbx/TCV/gdat_tcv.m
+++ b/crpptbx/TCV/gdat_tcv.m
@@ -1346,6 +1346,7 @@ elseif strcmp(mapping_for_tcv.method,'switchcase')
       gdat_data.dimunits{1} = 'rhopol\_norm';
       gdat_data.dimunits{2} = 's';
     end
+    gdat_data.x=gdat_data.dim{1};
     for it=1:length(psi_axis.data)
       ij=find(~isnan(q_rho.data(:,it)));
       if ~isempty(ij)