Simulation and Custom Slots
The list of slots may change depending on the user methods that are selected and when custom slots are added. The distinction is as follows.
Simulation slots
A part of the simulation object as either general slots or through a user method. The names of Simulation Slots are predetermined by the object and cannot be changed. Simulation slots have a white background in the icon. 
Custom slots
Created by the user on a simulation or data object. Custom slots have a pale yellow background on the icon. 
Revised: 08/04/2020