... gap

Based on observations made at the Astronomical Station Kryoneri, owned by the National Observatory of Athens, Greece.

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... CVs

I.e., those with well-sampled observed-minus-calculated (O-C) eclipse timings diagram covering more than a decade of observations.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy Inc., under contract with the National Science Foundation.

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... literature

Only timings while HT Cas was in quiescence were considered, including an X-ray timing obtained by Mukai et al. (1997).

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... database

CVcat/TPP is a web-based interactive database on cataclysmic variable stars (http://cvcat.net/).

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