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Fig. 2


(q − r) diagram for the 13 interacting binaries that were used in our analysis. Algols (q < 1) are at the left of the vertical line q = 1.0. The ten direct impact systems are located above the curve ωd (filled squares). The three systems with a transient accretion disk around the gainer are located between the curves ωmin and ωd (filled circles). Permanent accretion disks would be located below ωmin. Systems with q > 1 have not reached Algol characteristics yet.

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