You have actually raised a really good question!! A question that is entirely reasonable, especially for someone who hasn't been in the industry so long.
Those numbers represent what the pattern is supposed to be used for. The pattern is supposed to be used to CHARACTERIZE the scanners -- and, most importantly, only to characterize 30K and 12K scanners. The pattern was never intended for faster scanners (the likelihood of which you have is a different story entirely...)
Today the old ILDA pattern is causing some problems. Only those who have been in this industry for 20 years or more will remember the history of all of this, why the pattern says this, the benefits, drawbacks, and -- more importantly, when you SHOULD NOT use the pattern.
Since Pangolin now makes scanners capable of going as fast as 90K, we can now see the problems that this pattern presents. This pattern really can not be used to accurately characterize the performance of scanners other than decades old 12K scanners, or still decades old 30K scanners. Therefore a new pattern is needed.
Coincidentally, it is Pangolin's CTO who served on the ILDA technical committee so many years ago when this pattern was being developed, and the same guy now designs the new scanners too. So that guy is in a very good position to develop a new pattern, and one that should (based not only on your excellent question but other circumstances) clearly replace all ILDA patterns in Pangolin software.
The development of a new test pattern for ScannerMAX scanners was already under way. Your question makes it obvious that this pattern will have applications outside of the ScannerMAX division.
We therefore thank you for the question, and hope that the additional information provided here has been helpful.
Best regards,
William Benner