int_std_atm.csv

Taken from the ISA wikipedia page [here](https://en.wikipedia.org/wiki/International_Standard_Atmosphere).

***layer*** is the layer number 0 being closest to the surface  
***level_name*** is the layer name  
***h*** is the geopotential altitude in m  
***z*** is the geometric altitude in m  
***lapse_rate*** is the lapse rate in K/km of geopotential altitude  
***T*** is the base temperature for that layer  
***P*** is the base pressure for that layer  
***rho*** is the base density for that layer