1993J look closely similar in the range [$\sim\!\!$ ]{}4000–6000 Å, much of which is a forest of blends (with some hydrogen Balmer and lines as well). As noted by @Clocchiatti02, the main difference at this time between SNe 2001ig and 1993J is that [SN 2001ig]{} has stronger  H&K lines, weaker and lines, and faster expansion velocities.

Also mentioned by @Clocchiatti02, by 2002 Jan. 13 (the top spectrum in Figure \[f:mid\_spec\]), [SN 2001ig]{} has begun its transition from Type II to Type Ib. This transformation is marked by the decrease in strength of [H$\alpha$]{}and [H$\beta$]{} while the spectral features increase in strength. The most notable cases of this are the dramatic appearances of the $\lambda$6678 absorption feature, which appears as a notch on the red wing of the [H$\alpha$]{} absorption profile, and strong $\lambda$7065 absorption, which unfortunately coincides with a telluric absorption band in the day 41 and 57 spectra. This transformation continues during the subsequent two weeks of observations (i.e., the rest of the [SN 2001ig]{} spectra in Figure \[f:mid\_spec\]).

The minimum of the [H$\alpha$]{} absorption feature is becoming more complex and appears to have developed a doubled-troughed profile. This is to be expected since at this time [H$\alpha$]{} is 