This read-only object reports how many data values were captured for the fourth attribute identified by p2mpSnapAttr4Id, up to 4096 values, completing the set of size objects for a snapshot's four possible attributes. It tells a parsing application the final block size needed to fully read out all the data in a multi-attribute snapshot. For example, after processing the sizes for the first three attributes, a script would read p2mpSnapAttr4Size entries to retrieve the last attribute's captured samples.