Table 1: Observing parameters corresponding to the four studied pore regions. $\alpha $ denotes the direction to disk center (see Fig. 1; counterclockwise from the x-axis); $\cos\theta$ is the off-center position; $\lambda _{1/2}$ is the FWHM of the FPI; $N_{\lambda }$ and $\Delta \lambda $ give the number of spectral positions in one scan and the distance between two subsequent spectral positions; $t_{\rm ex}$ denotes the exposure times; $N_{\rm scan}$ is the number of scans in the time series and $\Delta t$ gives the time intervals between two subsequent scans, respectively.
region NOAA No. date $\alpha $ [$^{\circ}$] $\cos\theta$ line $\lambda _{1/2}$ [mÅ] $N_{\lambda }$ $\Delta \lambda $ [mÅ] $t_{\rm ex}$ [ms] $N_{\rm scan}$ $\Delta t$ [s]
P1 8737 Oct. 23, 1999 -24 0.97 Fe I 5576 52 11 35.25 20 19 70.0
P2 8737 Oct. 23, 1999 -48 0.98 Fe I 5576 52 11 35.25 20 19 70.0
P3 9140 Aug. 31, 2000 156 0.85 Fe I 7090 56 15 29.78 20 49 47.7
P4 9143 Aug. 31, 2000 75 0.92 Fe I 7090 56 15 29.78 20 49 47.7


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