the Russell-Merrill model (Sect. 6.2.1)]. The classical analysis, although carefully carried out, failed to yield the correct configuration let alone the correct ratio of sizes for the system. To be sure, the lack of radial velocity data did not help Carr's analysis, but the Russell-Merrill method does not permit these data be used in any rigorous way in the analysis itself. The WD analysis is essentially confirmed by Rainger et al. (1990) who used Hill's LIGHT2 program (see Sect. 6.3.3). However, even today, many intractable EB cases, especially those involving systems with thick disks, variable gas streams, atmospheric eclipse phenomena, and associated transient emission features, have not been satisfactorily solved with modern methods. And yet they were bravely tackled with the Russell-Merrill technique, because nothing else was available. Some of those cases still provide vigorous challenges to any light curve modeling code.

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