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Table 1.

Observing parameters.

(1) (2) (3) (4)
Filter SN1 SN2 SN3
RA (h m s) 22:36:05.30 22:36:05.30 22:36:05.84
Dec (° ′ ″) 33:58:59.9 33:58:59.9 33:59:09.6
Observing date 2016-07-09 2016-07-10 2015-08-07
2015-08-08
Spectral range T >  90% (nm) 363−386 482−513 648−685
Number of steps 85 169 342
Exp. time/step (s) 75 65 25
Total exp. time (h) 1.77 3.05 2.37
Mean resolution, R 500 760 1560

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