Solutions to the atmospheric neutrino anomaly which smoothly interpolate between nu (mu) --> nu (tau) and nu (mu) --> nu (s) oscillations are studied. It is shown that, although the Super-Kamiokande data disfavor the pure nu (mu) --> nu (s) channel, one cannot exclude sizable amplitude for the nu (mu) --> nu (s) channel in addition to nu (mu) --> nu (tau) oscillations.