Graph of brain source

Hello, I have computed the source files of the EEG data using Sloreta. Now, I need to extract topography graph of brain sources as mat.file. Is there a similar option in brainstorm?

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All the results you obtain with Brainstorm are .mat files.

For information on the storage of the various data types, read the sections "On the hard drive" in the introduction tutorials. For the source maps:
https://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation#On_the_hard_drive