request.setDomain(pair.domain);
request.addRangeTupleSlice(pair.range);
request.setIdentifier("col" + i);
request.setRangeLabel(label);
request.setAxisId(units);
ds[numCols++] = dsFactory.create(request);
if (dataset2Column != null) {
dataset2Column.put(numCols - 1, i);
}
}