Table 1: Log of observations of W601 and OI 201. Columns 1 and 2 give the UT date and the Heliocentric Julian Date of the observations. Column 3 gives the total exposure time. Column 4 gives the peak signal to noise ratio per 1.8 km s^-1 CCD pixel (at 708 nm for W601, and at 552 nm for OI 201) in the spectra, and Col. 5 gives the signal to noise ratio per 1.8 km s^-1 in the LSD Stokes V profiles. Column 6 gives the longitudinal magnetic field.

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