user: Question: What is the ERP W for the frequency of 91.3MHz?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['W284BC', 104.7, 'Waldorf, Maryland', 10.0, 'D', 'FCC']
SQL:

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