I have a chart that dynamically sets the upper and lower values and
increments based on a selected series using vba script. (Thanks to previous
posters and Jon Peltier for help with that!) I would now like to dynamically
set the number format for the tick mark labels.

For example, in one series, I may have labels of -1,000,000, -500,000, 0,
500,000, 1,000,000. In this case, I would like to format that as -1M, -.5M,
0, .5M, 1M. If I select a different series to be plotted in the same chart,
the gridlines may be -200,000, -100,000, 0, 100,000, 200,000. I would like
these to be formatted as -200K, -100K, 0, 100K, 200K.

Any thoughts on how to conditionally set those number formats?