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We observed the IW And-type dwarf nova ST Cha and found that standstills wereterminated by brightening at a constant brightness level during standstills.This finding is not consistent with a model of IW And-type dwarf novae assumingrepeated enhancements of the mass-transfer rate from the secondary. We foundthat one outburst in ST Cha had a shoulder during the rising branch at the samelevel in which standstills were terminated by brightening. This phenomenon isvery similar to what are called "embedded precursors" in SS Cyg stars. Wepropose that these embedded precursors in both SS Cyg stars and the IW And starST Cha occur when the disk reaches the tidal truncation radius. If this is thecase, precursors in SS Cyg stars and SU UMa stars are different in origin onthe contrary to the idea suggested by Cannizzo (2012).

On the nature of embedded precursors in long outbursts of SS Cyg stars as inferred from observations of the IW And star ST Cha