[FieldTrip] Help with plotting all the sensors belonging to the significant clusters in only one scalp topography

[赫雨欣]

Dear fieldtrip users:
I just started to use fieldtrip and I have a trivial question asking for help. 
I’m trying to find out the labels of the sensors belonging to the significant clusters. I think maybe I can find some threads in stat.posclusterslabelmat or stat.negclusterslabelmat and in stat.mask but  they are all in three dimensions chan_freq_time, I don’t know how to do it exactly in codes. 
Hope someone can help me. Thank you very much. 
From HeYuxin

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