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Finally, the extracted orders, sampled at constant wavelength steps
and corrected for the blaze effect, can be merged into a one
dimensional spectrum which is suitable for further analysis. The
merging algorithm computes a weighted average in the overlapping
region of adjacent orders. The normalised weight is a linear ramp
changing from 0 to 1 in the overlapping region for each of the
adjacent orders. Therefore, in the overlapping region of two
consecutive orders, the ramp decreases linearly for the `blue' order
while it increases linearly for the `red' order. This gives less
weight to points near the edges of the orders. It is also possible to
extract individual orders and store them in different spectral files
for further analysis. The command `MERGE/ECHELLE` performs the
merging of the orders.

*Petra Nass*

*1999-06-15*