Table 1 The observing log of IC 4642.
From: Uncovering the integral spectral characteristics of the planetary nebula IC 4642
Grating | No. of frames | Exposure time (s) | Date | Airmass |
|---|---|---|---|---|
B3000 | 3 | 10, 100, 1000 | 05/15/2018 | 1.11, 1.11, 1.10 |
R3000 | 3 | 10, 100, 1000 | 05/15/2018 | 1.11, 1.11, 1.10 |
