Could someone explain me this sentence reviewer below in blod underlined,

Authors should try to be more detailed in the description of analyses:
some of the details reported in the "Principal components analysis"
paragraph (Results) should be moved here.
Because a highly_/*asymmetric distribution could affect Principal
Component Analysis results,  symmetry of distribution should be
tested. Authors should also indicate if outliers were observed and
consequently excluded because they could affect factors*/_

Any help would be greatly appreciated!

Regards
ML

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