def VapEtlp_pT(P,T,x_N2):
	x = (P-5.58858049e+02)/3.71707300e-01
	y = (T--1.76272221e+02)/9.79506000e-02
	z = (x_N2-8.37725053e-01)/1.44673586e-02
	output = \
	    1*-3.97514806e+02
	vap_etlp = output*1.00000000e+00+0.00000000e+00
	return vap_etlp