In other words, the part throttle map is simply a series of points in which throttle inputs should correspond to available torque on the selected map. The map determines the shape of the powerband, and the throttle input is a certain percentage of the available power in that rpm value depending on the map chosen.
Say at 8,800 - 9,600 rpm on x map there are say 480nm of torque available, so the part throttle map at that rpm range should vary from min torque with throttle off monotonically increasing to 480 at full throttle. The pedal gradient simply follows the engine power curve.
The grey area is the powerband shape is free to modify and can be done from corner to corner, or on different parts of the track because the driver is free to choose different engine modes and maps.
Since the map can and does change the power delivery across the rev range that itself is a way to improve drivability out of corners or into them.
If through simulator and testing work one discovers that wheel spin happens on x corner at a certain torque value, they can shape the map to limit torque at a certain rpm range for that corner and give the driver an easier time getting on the throttle, and it's completely legal.
The height of cultivation is really nothing special. It is merely simplicity; the ability to express the utmost with the minimum. Mr.Lee