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Table 1:

Four Stokes parameter spectropolarimetric observations of $\alpha ^2$ CVn used for Magnetic Doppler Imaging.
UT Date Stokes JD (2 450 000+)     S/N
  Parameters Q      U      V      $\overline{\varphi}$ $\delta\varphi$ range
18 Feb. 1997 Q U V 498.511 498.531 498.489 0.038 0.004 420-550
19 Feb. 1997 Q U V 499.532 499.555 499.511 0.225 0.004 650-690
20 Feb. 1997a     V     500.422 0.387   550
21 Feb. 1997 Q U V 501.490 501.504 501.470 0.582 0.003 270-320
22 Feb. 1997 Q   V 502.549   502.519 0.773 0.003 320-490
23 Feb. 1997 Q U V 503.497 503.516 503.474 0.949 0.004 240-280
25 Feb. 1997b     V     505.581 0.331   470
25 Feb. 1997 Q U   505.695 505.715   0.353 0.002 410-410
07 Feb. 1998 Q U V 852.562 852.584 852.539 0.771 0.004 740-890
09 Feb. 1998 Q U V 854.561 854.584 854.539 0.137 0.004 820-1020
11 Feb. 1998 Q U V 856.545 856.567 856.524 0.499 0.004 910-1020
12 Feb. 1998 Q U V 857.675 857.694 857.657 0.706 0.003 820-880
13 Feb. 1998 Q U V 858.555 858.574 858.537 0.867 0.003 710-810
15 Feb. 1998 Q U V 860.605 860.626 860.586 0.242 0.004 500-720
16 Feb. 1998 Q U V 861.606 861.627 861.584 0.424 0.004 560-750
17 Feb. 1998 Q U V 862.533 862.554 862.515 0.594 0.004 560-560
19 Feb. 1998 Q U V 864.603 864.638 864.576 0.973 0.006 430-590
15 Jan. 1999 Q   V 1194.621   1194.600 0.310 0.002 400-450
19 Jan. 1999 Q U V 1198.652 1198.672 1198.633 0.049 0.004 770-840
26 Jul. 2004 Q U V 3213.362 3213.381 3213.400 0.413 0.004 440-480

Notes. Columns give the UT date for the beginning of the night when observation was obtained, the Stokes parameters observed (in addition to Stokes I), the Julian Dates of mid-exposure for each observed Stokes parameter, the mean phase $\overline{\varphi}$ for all observed Stokes parameters, the maximum difference $\delta\varphi$ between $\overline{\varphi}$ and the phases of individual Stokes parameter observations, the range of the signal-to-noise ratio per 2.6 km s-1 spectral pixel for two or three exposures.
(a) The Stokes Q and U spectra are disregarded. See text for detailed explanation. (b) The Stokes V observation is considered individually due to a larger-than-average phase difference with respect to the linear polarization spectra obtained on that night.


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