ECH_WCENTRAL

Determine the central wavelength in Angstroms

Description

Use the grating equiation directly to determine the central wavelength.

ECH_INIT must be called before calling this routine.

Invocation

CALLECH_WCENTRAL (M, THETA, GAMMA, WC, STATUS)

Arguments
READ M INTEGER

Order number

READ THETA REAL

Echelle theta angle corresponding to the current configuration (radians)

READ GAMMA REAL

Echelle gamma angle corresponding to the current configuration (radians)

WRITE WC REAL

Central wavelength of this order (Angstroms)

READ, WRITE STATUS INTEGER

Global status value

Bugs

None known.

Authors

C.J. Hirst UCL (ZUVAD::CJH)