High harmonics were causing some extra reflections; were removed by going away from the middle of the pitch to ~90% of intensity.
The cryo was installed during the day.
Ka/Kb in the same spectrometer configuration was measured in the evening and night. Alignment was not easy, because samples were not thin: there was sometimes a double layer.
Next set of samples go into the cryo at 2 pm. This time they are supposed to be finer powder and the captons should be stuck together.