Function:     units

Purpose:      Units returns the type of units.

Category:     PHYSICAL COORDINATES

File:         factor.c

Author:       P.R. Roelfsema

Use:          INTEGER UNITS( CUNIT )     Input    CHARACTER*(*)

              UNITS      Returns:
                          0: unknown units.
                          1: angle units (degrees, seconds etc.)
                          2: length units (kilometers, Angstrom etc.)
                          3: time units (seconds, hours days etc.
                          4: frequency units (Hz, MHz etc.)
                          5: speed units (m/s, km/s etc. )
                          6: teperature units (kelvin, millikelvin )
                          7: fluxdensity units (Jy, mJy)
                          9: optical depth (tau)
                         10: Energy (J, eV, erg, Ry)
              CUNIT      Name of unit.

Notes:        The type of units which are implemented are listed in
              factor.dc2.

Updates:      Aug 28, 1991: PRR, document created.