The tmnxNatPlHistTable contains a histogram of a particular NAT pool. Conceptual rows in this table are created using the tmnxNatPlHistAction objects. The information in this table is not saved in the configuration file, and is lost after a High Availability switch-over. The tmnxNatPlHistTable contains an instance of a histogram of a particular NAT pool at a particular time; while reading this table, check if the content is consistent; another SNMP client may have requested a new histogram of the same or another NAT pool, with the same or other parameters; after requesting a new histogram, verify if the first row matches the given parameters and note the timestamp; while reading more rows, verify that the subsequent rows have the same timestamp.