"heat flow values"
Heat flow is the measure of the rate at which heat energy seeps out from the interior of a planet to its exterior. In sedimentary basins on Earth, the value is typically 60 to 80 mW/m^2 (milliWatts per square metre). (Sunshine on Earth is 1350 Watts per square metre). This almost infinetisimal amount of heat is the engine that drives plate tectonics and all the volcanoes on Earth.
A "heat flow value" is whatever heat flow is measured or theorised to be.