Table 3: Measured photometry of the selected nebular features. The x and y columns list the coordinates of the selected pixels in the data cube. The angular radius $\theta _i$ of these pixels is counted in arcseconds from RS Pup, and the azimuth is measured from north ( $N=0^\circ$ , $E=90^\circ$ ). The coordinates of RS Pup in the image, in pixels from the bottom left, are $x=619.3 \pm 0.2$ , $y=628.2 \pm 0.2$ . ``Mean_i'' is the average value, and A_i the amplitude of the adjusted photometric curve, expressed in ADU and $\Delta \phi _i$ is the phase offset with respect to RS Pup, with its associated total error (see text). N_i is the computed integer number of periods between the variation cycle of RS Pup and that of the feature. d_i is the derived distance to RS Pup. The six selected features for the final distance computation are marked with * in the first column (see Sect. 4.4 for details).
# x (pix) y (pix) $\theta _i$ ( $^{\prime\prime}$ ) Azimuth $(^\circ$ ) Mean_i (ADU) A_i (ADU) $\Delta \phi _i$ N_i $d_i \pm \sigma$ (pc)

1 578 748 21.10 139 185 $\pm$ 3 313 $\pm$ 11 0.983 $\pm$ 0.020 5 2034 $\pm$ 7

2* 522 710 21.16 170 185 $\pm$ 15 280 $\pm$ 17 0.809 $\pm$ 0.012 5 1969 $\pm$ 5

3* 493 659 21.65 196 175 $\pm$ 19 274 $\pm$ 43 0.989 $\pm$ 0.013 5 1985 $\pm$ 5

4* 528 668 16.58 186 171 $\pm$ 11 241 $\pm$ 19 0.576 $\pm$ 0.009 4 1980 $\pm$ 4

5* 549 694 16.03 167 232 $\pm$ 14 275 $\pm$ 28 0.504 $\pm$ 0.083 4 2016 $\pm$ 38

6 542 624 12.89 213 181 $\pm$ 3 291 $\pm$ 20 0.102 $\pm$ 0.023 3 1726 $\pm$ 14

7* 568 587 10.96 249 155 $\pm$ 9 274 $\pm$ 15 0.098 $\pm$ 0.023 3 2028 $\pm$ 16

8* 655 456 29.28 312 99 $\pm$ 9 151 $\pm$ 20 0.207 $\pm$ 0.036 8 2010 $\pm$ 9

9 695 717 19.42 80 87 $\pm$ 6 83 $\pm$ 4 0.697 $\pm$ 0.016 5 2104 $\pm$ 6

10 569 719 17.28 149 197 $\pm$ 6 220 $\pm$ 9 0.602 $\pm$ 0.014 4 1910 $\pm$ 6

**Table 3:** Measured photometry of the selected nebular features. The x and y columns list the coordinates of the selected pixels in the data cube. The angular radius $\theta _i$ of these pixels is counted in arcseconds from RS Pup, and the azimuth is measured from north ( $N=0^\circ$ , $E=90^\circ$ ). The coordinates of RS Pup in the image, in pixels from the bottom left, are $x=619.3 \pm 0.2$ , $y=628.2 \pm 0.2$ . ``Mean_i'' is the average value, and A_i the amplitude of the adjusted photometric curve, expressed in ADU and $\Delta \phi _i$ is the phase offset with respect to RS Pup, with its associated total error (see text). N_i is the computed integer number of periods between the variation cycle of RS Pup and that of the feature. d_i is the derived distance to RS Pup. The six selected features for the final distance computation are marked with * in the first column (see Sect. 4.4 for details).
#	x (pix)	y (pix)	$\theta _i$ ( $^{\prime\prime}$ )	Azimuth $(^\circ$ )	Mean_i (ADU)	A_i (ADU)	$\Delta \phi _i$	N_i	$d_i \pm \sigma$ (pc)
1	578	748	21.10	139	185 $\pm$ 3	313 $\pm$ 11	0.983 $\pm$ 0.020	5	2034 $\pm$ 7
2*	522	710	21.16	170	185 $\pm$ 15	280 $\pm$ 17	0.809 $\pm$ 0.012	5	1969 $\pm$ 5
3*	493	659	21.65	196	175 $\pm$ 19	274 $\pm$ 43	0.989 $\pm$ 0.013	5	1985 $\pm$ 5
4*	528	668	16.58	186	171 $\pm$ 11	241 $\pm$ 19	0.576 $\pm$ 0.009	4	1980 $\pm$ 4
5*	549	694	16.03	167	232 $\pm$ 14	275 $\pm$ 28	0.504 $\pm$ 0.083	4	2016 $\pm$ 38
6	542	624	12.89	213	181 $\pm$ 3	291 $\pm$ 20	0.102 $\pm$ 0.023	3	1726 $\pm$ 14
7*	568	587	10.96	249	155 $\pm$ 9	274 $\pm$ 15	0.098 $\pm$ 0.023	3	2028 $\pm$ 16
8*	655	456	29.28	312	99 $\pm$ 9	151 $\pm$ 20	0.207 $\pm$ 0.036	8	2010 $\pm$ 9
9	695	717	19.42	80	87 $\pm$ 6	83 $\pm$ 4	0.697 $\pm$ 0.016	5	2104 $\pm$ 6
10	569	719	17.28	149	197 $\pm$ 6	220 $\pm$ 9	0.602 $\pm$ 0.014	4	1910 $\pm$ 6

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