// No information given for this timelevel; assume not written
            if (tl >= int(will_write.at(groupdata.groupindex).at(vi).size()))
              continue;

    for (const auto &wr : writes)

    for (const auto &wr : writes) {
      if (wr.tl >= int(gfs.at(wr.gi).at(wr.vi).size()))
        gfs.at(wr.gi).at(wr.vi).resize(wr.tl + 1);

    }