Trending plot for order-definition calibrations.
This plot shows the total number of found orders and the y position of two
dedicated orders on the detector.</font><p><font size="2">

For the HR and UHR modes, the pipeline recipe should identify 170 orders in
total, 90 on the BLUE chip and 80 on the RED chip. This number is trended
separately for fibres A and B.</font><p><font size="2">

For trending the order position on the detector, a central order number has been
chosen. The y position of this order is trended separately for the BLUE and
the RED chip and for fibres A and B.