--outfile-format for WPA

[Mem5]

Hi,

Trying to set --outfile-format=3 on a WPA (-m 2500) crack, output is :

f19f30e637df454f29xxxx6b0e2aaxxx : MAC_AP : MAC_STA : ESSID : PLAIN

Question : what's the first part (32 chars hash) ?!
I can't find it in the hccapx file, where does it come from ?

Thank you.