Xspec

Emission Measure = Norm(xspec.apec) * ( 4 * pi() * ( (Distance[cm] * (1 + z) )^2 ) * (10^14) )

Norm="3.00E-03"
Distance="10.0"
Convert="3.08568025E+21"
calc "printf(\"%.2e\n\", ${Norm}*(4*pi()*((${Distance}*${Convert}*(1+0))^2)*(10^14)))"

Bolometric Lx = Norm(xspec.bb) * ( (Distance[kpc] / 10 )^2 ) * (10^39) [erg s-1]
Radius = sqrt ( Lx / ( 4 * pi() * Stefan-Boltzman * T(K)^4 ) )

5.670400*10^-5 [erg s^-1 cm^-2 K^-4]
5.670400*10^-1 [erg s^-1 m^-2 K^-4]
5.670400*10^-8 [J s^-1 m^-2 K^-4]
5.670400*10^-8 [W m^-2 K^-4]

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