FCOM also provides "Minimum Contol" values for V1,R,2. A different table, only pressure altitude (no weight). These are significantly lower and decrease with pressure altitude. What are they and why they lower with increasing p.a.
I'd guess that what these are are the minimum values of V1/Vr/V2 which respect the various limitations with respect to minimum control speed (V2 not less than 1.1 Vmca, etc., etc.)
They are reducing with pressure altitude because (I suspect) the minimum control speed is scheduled with pressure altitude, to reflect the fact that at higher altitudes the engine thrust is lower, therefore the VMCs are also lower. This is commonly done as a means of recovering some of the performance lost due to the thrust decrease.