Extruding ratio definiation
T0 = extruder1, T1 = extruder2. P0.5 means T0 will extrude at 0.5 ratio of total extrusion. While the rest of the extrusion will fill up by the T1.
The ratio defination can be any number between 0-1. So this command have to be added to custom gcode section of slicers to define multiple extruders/material of multi-color/material printing.