Astrometric planet search around southern ultracool dwarfs - IV. Relative motion of the FORS2/VLT CCD chips

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Table 3.

rms of additional bias σ_bias in the epoch residuals in mas obtained with and without RCM correction, for the short-, medium-, and long-duration datasets indicated by Δt.

	Δt
Correction type	Short	medium	Long
No correction	0.11	0.53	0.54
Equation (19)	0.08	0.22	0.16
Equation (18)	0	0	0.02

Notes. Equation (18) uses discrete estimates g_e derived from calibration files for each epoch e, while Eq. (19) uses functional expressions for the chip motion in time.

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