Aperture synthesis imaging of the carbon AGB star R Sculptoris - Detection of a complex structure and a dominating spot on the stellar disk

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Table 2

Log of our PIONIER observations.

Target	Date	JD^a	Baseline	# obs.^b

R Scl	2014-08-25	56 895	A1/G1/J3/K0	10
R Scl	2014-08-26	56 896	A1/G1/J3/K0	7
R Scl	2014-09-02	56 903	D0/G1/H0/I1	15
R Scl	2014-09-06	56 907	A1/B2/C1/D0	11
R Scl	2014-09-07	56 908	A1/B2/C1/D0	14
R Scl	2015-11-28	57 355	A0/G1/J2/J3	1
R Scl	2015-12-02	57 359	A0/B2/C1/D0	1

Notes.

^(a)

JD-2 450 000.

^(b)

Each observation consists typically of five consecutive measurements. Each of these measurements contains six squared visibility values and four closure phases at three (2014) or six (2015) spectral channels.

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