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We also checked for trends in the offsets as function of both RA and dec. The first two plots show RA_offset and DEC_offset in arcsec as function of teldec. The color of the dots encodes the hour angle.

June RA_offset as function of teldec (and HA) [arcsec]
June DEC_offset as function of teldec (and HA) [arcsec]

A strong undulation can be observed. The offsets are also not centered at 0 as was already shown by the previous set of lots.

For July the situation looks quite different:

July RA_offset as function of teldec (and HA) [arcsec]
July DEC_offset as function of teldec (and HA) [arcsec]

The declination dependents of both RA and dec offsets has disappeared. The offsets still depend on HA but to a much smaller extent compared to the situation in June.