computes doppler profile given 

 ny0 - line frequency at rest
 ny - frequency grid
 te - temperature of formation of line
 u(x,y) - velocity
 chi: non-thermal line broadening in km/s
 awgt: atomic weight of atom

 output: phiny(ny,x,y)
 
 Oivind Wikstol     12.02.04  ver 1.0

 NAME:
	PHOTONS_TO_ENERGY

 PURPOSE:
	Convert intensity from photons [ph m-2 s-1 sr-1] to energy in SI units
       [W m-2 sr-1]
	

 CATEGORY:
	Solar-B utilities software

 CALLING SEQUENCE:
	photons_to_energy, inval, wavel, outval


 INPUTS:
	inval:	Input intensity ([ph m-2 s-1 sr-1])
       wavel:  photon wavelength IN ANGSTROMS!!

 KEYWORD PARAMETERS:

 OUTPUTS:
	outval:  Intensity in SI units[W m-2 sr-1]

 CALLS:
 COMMON BLOCKS:

 PROCEDURE:

 RESTRICTIONS:
	Input in SI, i.e. [ph m-2 s-1 sr-1]
	Photon wavelength in ANGSTROM only

 MODIFICATION HISTORY:
	07-Sep-2005: Written by Oivind Wikstol