I have been playing with tuner pro recently...  it is buggy when it comes to the 512x1 map (mlhfm) for mass air.  Basically you get one shot to edit, then the whole thing crashes.  Copying/pasting the entire range of cells also results in a crash.  I like the interface and compare features, but there's a lot to be desired for graphing.  When you click on a point, it should highlight the cell, and allow you to bump it up or down with the arrow keys.

So Mark looked into this further, and the xdf I have should have been setup with 1 column and 512 rows, instead of vice versa.  The control has a limit of 256 columns, but it's not being enforced, and that's when it blows up.

I have used WinOLS, but never liked it. So I ended up writing my own map editor. WinOLS is the defacto standard though.