Extract data / import values from ICA results

Dear CONN users

I have problems figuring out which values are automatically extracted from ICA results. After loading the spm.mat file (second level results) in REX the software seems to extract data from the following first level files:

[b]BETA_Subject*_Condition*_Measure*_Component*.nii[/b]

However, it is not clear to me what these images represent.

Any help would be highly appreciated. I searched the whole archive, however, couldn't find an answer

Thank you very much

Felix