The CTP: GWE Constant Temperature Package pane is used to activate the Constant Temperature package. It is on the MODFLOW Packages and Programs dialog box under Groundwater Transport| | Groundwater Energy Transport Process.
"Multipliers" can be used with CTP boundaries. Multipliers will be used if the "Use Multiplier" checkbox is checked.. Ordinarily, multipliers are not needed. If multipliers are used, the temperature is multiplied by the value of the multiplier. One use for multipliers might be when the temperatures are defined using a time-series and it is desired to multiply the temperature values in the time series by a different amount at different locations.