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Table 1

Log of the SPHERE observations.

NR
Mira
Airmass 1.077–1.083
Seeing 0.62–0.87 arcsec
ND filter None
DIT 1.25
NDIT 18
Exp. time 27 min
HD 12642
Airmass 1.141–1.159
Seeing 0.76–0.83
ND filter ND_1
DIT 5.0
NDIT 8
Exp. time 16 min
cnt748 + cnt820
Mira
Airmass 1.083–1.111
Seeing 0.67–0.78
ND filter ND_1
DIT 1.6
NDIT 20
Exp. time 25.6 min
HD 12642
Airmass 1.162–1.188
Seeing 0.73–0.83
ND filter ND_1
DIT 5.0
NDIT 10
Exp. time 10 min

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