add new array of gas traces and add source for rtc request

matlab/TCV/gdat_tcv.m

@@ -1373,10 +1373,11 @@ elseif strcmp(mapping_for_tcv.method,'switchcase')
                gdat_data_data_refs{i}.data_fullpath = params_eff.data_request;
              end
              params_eff.data_request = sprintf('\\atlas::top.system.gas.valve_0%.2d:flow',i);
-             gasrequest = gdat_tcv(gdat_data.shot,params_eff); gasrequest.units = 'V';
+             gasrequest = gdat_tcv(gdat_data.shot,params_eff);
              gdat_data_data{i} = gasrequest;
              if ~isempty(gasrequest.t) && isempty(gdat_data.t) % copy 1st non-empty
                gdat_data.units = gasrequest.units;
+               if isempty(strtrim(gdat_data.units)), gdat_data.units = 'particles/s'; end
                gdat_data.t = gasrequest.t;
                gdat_data.data_fullpath = gasrequest.data_fullpath;
              end