coesa76_coeffs.npz: Coefficients of equations from which the pressure and density for geometric altitudes from 86 km to 1000 km are computed. The basic equation form is EXP( A × z^4 + B × z^3 + C × z^2 + D × z + E ) More info to see http://www.braeunig.us/space/atmmodel.htm#USSA1976 nrlmsis00_data.npz: