How To
The WAN Utilisation Distribution Report uses 'mode=>MAX' to ensure it is using the most accurate summarized data available for the task at hand.
NMIS version 8.6.8G (and newer) export data using both 'mode=>AVERAGE' and 'mode=>MAX'.
...
NMIS will then open a form for that desired node - to get NMIS node.pl to open click on one of the graph images - for example the graph highlighted in blue on this image: