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1. The wavelength calibration and sky subtraction are not yet perfected, resulting in some residuals in sky subtracted images and mismatch of sky lines in wavelength space for adjacent orders. It is *pretty* good, but we'd like residuals at the 0.1 pixel level and are continuing to work on this problem. Current RMS in the wavelength fit is ~0.3-0.5 pixels.
2. The code currently crashes when attempting to combine the reddest order into the final 1d spectrum. For this reason we have restricted the combine operation to one order below this. It appears to be a bookkeeping error and will be fixed (we hope) in the next release.