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Table A.2

Optical spectroscopy of iPTF15dtg.

Date (UT) JD-2 457 000 Phasea Telescope Instrument Range
(days) (days) (Å)

10 Nov. 2015 336.60 +3.2 TNG DOLORES 34358076
11 Nov. 2015 337.98 +4.5 Keck1 LRIS 307410 278
23 Nov. 2015 350.46 +17.0 TNG DOLORES 356110 462
02 Dec. 2015 358.85 +25.4 DCT Deveny+LMI 32727731
06 Dec. 2015 362.50 +29.1 Keck1 LRIS 307010 232
10 Dec. 2015 367.43 +34.0 NOT ALFOSC 34829083
10 Jan. 2016 398.32 +64.9 TNG DOLORES 33829600
28 Jan. 2016 416.37 +82.9 NOT ALFOSC 34639143
11 Feb. 2016 430.42 +97.0 TNG DOLORES 33719609
09 Mar. 2016 456.73 +123.3 Gemini North GMOS 37969346

Notes.

(a)

From explosion date.

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