for (int i = 0; i < n; i++) {
if (fixingSeries[i].isEmpty()) {
laggedFixingSeries[i] = ImmutableZonedDateTimeDoubleTimeSeries.ofEmpty(tomorrow.getZone());
} else {
final ZonedDateTimeDoubleTimeSeries ts = fixingSeries[i].subSeries(fixingSeries[i].getEarliestTime(), tomorrow);
final ZonedDateTimeDoubleTimeSeriesBuilder bld = ts.toBuilder();
bld.put(tomorrow, ts.getLatestValue());
laggedFixingSeries[i] = bld.build();
}
}
return laggedFixingSeries;