  Eclipses of the hot spot in Z Cha and OY Car observed by many authors during
their quiescence are re-analyzed. Distances of the spot from the center of the
disk r_s are determined from phases of ingress and egress. In the case of
several eclipses of Z Cha and nearly all eclipses of OY Car it is found that
r_s(egress) < r_s(ingress). This implies that they are not representative for
the radius of the disk r_d and is interpreted as being due to the stream
overflow. The r_s(ingress) - dt relations (where dt is the time since last
outburst) are improved when points affected by the stream overflow are omitted.
