z_from_linepos

mpdaf.sdetect.z_from_linepos(iden, wavelength, vac=True)[source]

Returns the redshift at which a line has the given position.

Parameters
idenstr

Identifier of the line.

wavelengthfloat

Position of the line in Angstrom.

vacbool, optional

If True, the position is given in vacuum, else it is given in air.

Returns
redshift: float
Raises
ValueError is iden does not refer to a known line.