2 Routine Summary

The following routines are available. Refer to the next section for an overview of how they are used.

ECH_BLOCK:

BLOCKDATA to initialise spectrograph configuration COMMON block

ECH_COLLIMATOR:

Determine which collimator to use at a given wavelength

ECH_DISP:

Determine the dispersion in mm for a given wavelength in a given order at a specified configuration

ECH_FORMAT_CENTRE:

Determine the appropriate spectrograph settings to place a specified wavelength in a specified order at the centre of the field

ECH_FRSPR:

Determine the free spectral range in Angstroms of a specified order at a specified configuration

ECH_INIT:

Initialise COMMON blocks for a specified instrument combination

ECH_LOAD:

Load COMMON blocks describing spectrograph parameters

ECH_ORDERNUM:

Determine the order number of a specified wavelength at a specified configuration

ECH_PRISMPOS:

Determine the optimal prism rotation and position at a specified wavelength

ECH_REFINDEX:

Determine the refractive index of fused silica at a specified wavelength

ECH_SLITANGLE:

Determine the optimum slit angle at a specified configuration

ECH_WAVECEN:

Determine the central wavelength of the order nearest to the centre of the field at a specified configuration

ECH_WCENTRAL:

Determine the central wavelength in Angstroms in a specified order at a given configuration

ECH_XDISPFS:

Determine the cross-dispersion in mm for a given wavelength at a specified configuration