CREATE TABLE table_63406 ("Callsign" TEXT, "Network" TEXT, "City of License" TEXT, "D ERP" TEXT, "Owner / Operator" TEXT)

What's the D ERP in San Martin Texmelucan, Puebla?
SELECT "D ERP" FROM table_63406 WHERE "City of License" = 'san martin texmelucan, puebla'
SELECT "D ERP" FROM "table_63406" WHERE "City of License" = 'san martin texmelucan, puebla'