Dear experts,

While visualizing my polar angle results using angle file, I almost don't get any interpretable results. However, if I show results with real+imag file, taken from the following link (MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be http://sites.psych.ualberta.ca/kylemathewson/retinotopy-in-freesurfercnl-protocol/#VIEW), I have a clearer map. 

Can you help me? Does it make sense to visualize with real and imag files layered on top of each other? Eccentricity results work fine with both of the visualization approach, what might be wrong it polar angle? I appreciate any cue.

Thanks in advance!

Beyza