diff --git a/crpptbx/TCV/gdat_tcv.m b/crpptbx/TCV/gdat_tcv.m
index 0761ac1127c25f9898263e140b2f1e57b3789798..dd7f3cb9621c2455482f71bdba3dc7157cdaa0e5 100644
--- a/crpptbx/TCV/gdat_tcv.m
+++ b/crpptbx/TCV/gdat_tcv.m
@@ -600,10 +600,10 @@ elseif strcmp(mapping_for_tcv.method,'switchcase')
     end
     gdat_data.gdat_params.time_interval = time_interval;
     gdat_data.gdat_params.cxrs_plot = cxrs_plot;
-    if isfield(params_eff,'fit_tension') && params_eff.fit_tension>0
+    if isfield(params_eff,'fit_tension')
       fit_tension = params_eff.fit_tension;
     else
-      fit_tension = -30.;
+      fit_tension = -100.;
     end
     gdat_data.gdat_params.fit_tension = fit_tension;
     cxrs_params.prof.Ti.taus = fit_tension; cxrs_params.prof.vi.taus = fit_tension; cxrs_params.prof.nc.taus = fit_tension; cxrs_params.prof.zeff.taus = fit_tension;