Like blackbody_nu() but for B_{\lambda}(T).
in_x : number, array-like, or Quantity
Frequency, wavelength, or wave number. If not a Quantity, it is assumed to be in Angstrom.
temperature : number or Quantity
Blackbody temperature. If not a Quantity, it is assumed to be in Kelvin.
flux : Quantity
Blackbody monochromatic flux in erg \; cm^{-2} s^{-1} \AA^{-1} sr^{-1}.