public IEnumerable <Prr> GetPrrs(Wrr wrr)
{
wrr.StdfFile.GetRecordsEnumerable().Any();
//find the part extents within the wafer extent
var waferExtent = _WafersMap.GetExtents(wrr);
return(from pe in _PartsMap.GetExtentsListWithin(waferExtent)
from prr in GetRecordsInExtentsReverse(pe)
.TakeWhile(r => r.GetType() == typeof(Prr))
.Select(r => (Prr)r)
select prr);
}
