2. An optical flare on YZ CMi. Gunn A. G., Doyle J.G., Mathioudakis M. & Avgoloupis S., A & A, 1994, 285, 187. Compressed Postscript (33 kbytes) Compressed PDF (191 kbytes) ABSTRACT. We present and discuss observations of an energetic optical flare on the dM4.5e star YZ CMi (Gl 285). The flux-time variations and energy release of the flare are fully consistent with previous observations of this star. The observations have also revealed a symmetric excess emission in the bases of the chromospheric Balmer lines. If due to a bulk plasma motion event, the maximum extension in the Balmer wings represents a Doppler velocity of approximately 250 km/s.