a) DP observed on the longest baseline in the data set #9 (Bp = 40.36 m) is plotted by the red solid line. The black line represents the scaled observed spectrum. The DP and spectrum are binned with a spectral resolution of 6000. The dashed line represents the linear fit at the selected continuum points as described in Appendix C. DP = 0 is shown by the dotted line. b) Enlarged view of panel a) for the CO lines. Note that the DP in the continuum points between the adjacent CO lines deviates from zero. c) DP after subtracting the linear fit to the continuum points as described in Appendix C is shown by the red solid line. The black line represents the scaled spectrum. The DP in the continuum points between the adjacent CO lines is now zero within the measurement errors.
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