for (TimespanList::iterator ts_it = ts_list->begin(); ts_it != ts_list->end(); ++ts_it) {
for (format_it = formats.begin(), filename_it = filenames.begin();
format_it != formats.end() && filename_it != filenames.end();
++format_it, ++filename_it) {
for (TimespanList::iterator ts_it = ts_list->begin(); ts_it != ts_list->end(); ++ts_it) {
for (format_it = formats.begin(), filename_it = filenames.begin();
format_it != formats.end() && filename_it != filenames.end();
++format_it, ++filename_it) {