Radio measurements and parameterized model for SN 2001gd at 1.3 cm (circles; solid line), 2 cm (crosses; dashed line), 3.6 cm (squares; dash‐dotted line), 6 cm (triangles; dotted line), and 21 cm (diamonds; dash–triple‐dotted line). The lines represent the best‐fit model as described in the text with the parameters listed in Table 2. SN 2001gd is believed to have exploded 83 days prior to its initial optical discovery; see § 1 for further explanation (Nakano et al. 2001; Matheson et al. 2001).