Two additional phase classes (CHG_BASE and DRAIN) were imported as part of the Startup.fhx file. The diagrams for the running logic for these phase classes are included in the following topics. CHG_BASE requires creation of a BASE_HEADER module similar to the COLOR_HEADER module created earlier. When CHG_BASE is assigned to the BLENDER unit class, two aliases, BASE_OUT_FLOW and BASE_OUT_PUMP, are automatically generated. These aliases must be resolved in the UM_BLEND_500 and UM_BLEND_600 unit modules.