user: Question: Which ERP W is the lowest one that has a Frequency MHz of 91.3?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['WLPE', 91.7, 'Augusta, GA', 1150.0, 'A', 'FCC']
SQL:

assistant: SELECT MIN("ERP W") FROM "Table" WHERE "Frequency MHz" = 91.3;