Open Access

Table A.1

Summery of spine fitting parameters.

Inner radius (px) Outer radius (px) Bright radius(a) (px) Bin size(b) (px) Init. rot. angle(c) (°)
STIS 8 23 11 1 (3) 70.0
IFS 28 67 53 5 (7) 65.0 (70.4)
IRDI 17 41 / 3 65.0 (70.4)

Notes. Values used to determine the vertical profiles that are median combined in the horizontal direction for bin sizes > 1 pixel. (a)Separation after which the bin value is increased by 2 pixels, for example, STIS bins are located at separations of [8,9,10,11,14,17,…] pixels from the image centre. (b)Width of the vertical slices; value in the brackets are the bin size after the bright radius. (c)Initial angle used to rotate the image clockwise so the disk lies horizontal; value in brackets are the fixed angle used for the final SPHERE spine fit derived from the STIS PA.

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