def rvShift(wavelength, rv):
	"""
	Perform the radial velocity correction.

	Parameters
	----------
	wavelength 	: 	numpy array 
					model wavelength (in Angstroms)

	rv 			: 	float
					radial velocity shift (in km/s)

	Returns
	-------
	wavelength 	: 	numpy array 
					shifted model wavelength (in Angstroms)
	"""
	return wavelength * ( 1 + rv / 299792.458)