Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What's the network that has a callsign of XHTM and a D ERP of •?

### Inputs:
table_name: table, columns: ['Callsign', 'Network', 'City of License', 'D ERP', 'Owner / Operator']

### Response:
SELECT Network FROM table WHERE D ERP = • AND Callsign = xhtm