ISA is the air pecific gravity @ geopotential km.
It collects the three segments 0..11..20..85.
Each segment comes c/w its respective tool box,
though segment ISA2085 is from Mathcad 11.

Jean

Genfit Minimize [PDAS1120].sm (37 KiB) downloaded 49 time(s).
Thiele QUICK [ISA2085].sm (55 KiB) downloaded 46 time(s).
Inst_ISA.sm (146 KiB) downloaded 42 time(s).
Thiele QUICK [PDAS11].sm (54 KiB) downloaded 46 time(s).