user: Question: What's the network that has a callsign of XHTM and a D ERP of •?
Columns: ['Callsign', 'Network', 'City of License', 'D ERP', 'Owner / Operator']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['XHBD', 'Canal de las Estrellas', 'Aguascalientes, Aguascalientes', '•', 'Televimex ( Zacatecas )']
SQL:

assistant: SELECT "Network" FROM "Table" WHERE "D ERP" = '•' AND "Callsign" = 'XHTM';