MN = TAS / LSS
At 35000' ISA temp = -55 degrees C
add 273 to get Kelvin = 218 K
LSS = 38.94 sqr root (Temp K)
LSS = 575
MN = TAS / LSS
0.76 = TAS / 575
TAS = 0.76 x 575
TAS = 437
repeat this at 5000' lower intervals for example to get a plot of TAS with altitude down to 20000'
Use the CRP5 to calculate corrected TAS with altitude from 20000' to 35000' using an IAS of 300 KT
The lines will cross over