MASTER March 2004 spectral calibration.

Spectral check (three bands per port measured) was performed in March 2004.
The spectral shifts of 0nm, -1nm, -4nm, and +5nm were found
in ports 1, 2, 3, and 4 respectively.  All measured curve shapes were identical to shapes measured in December 2003.  December 2003 curves were shifted spectrally to reflect new positions.