.mat files saved in Version 7.3 format

nyxlabels/update_trx_with_labels.m

@@ -80,7 +80,7 @@ end
 
 if isfield(args, "outputfile")
     trx = updated_trx;
-    save(args.outputfile, "trx");
+    save(args.outputfile, "trx", "-v7.3");
 end
 
 function label = map_label(args, label)