gauss ⚬ˣˢᵖᵉᶜ｜appendage｜___｜20260628155835-02-•

A	B
par1	$E_l$, source frame line energy in keV
par2	$\sigma$, source frame line width in keV
par3	$z$, redshift
Norm	$K$, source frame total photons/cm${}^2$/s in the line

(echo:: @ ᯤ)