z_from_linepos

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

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.