The lamp flux [ ADU/sec] and the flat counts are monitored in NIR-arm
calibration flat frames. They are composed of ten raw
frames (five on-lamp frames and five off-lamp frames), while health check IFU flats (see
FLAT_IFU_HC_NIR) are composed of two raw frames.

For more information see the
<a href="http://www.eso.org/observing/dfo/quality/XSHOOTER/qc/flat_qc1.html">plot tutorial page</a>.