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tokens: ACKNOWLEDGEMENTS The authors thank the reviewer for a thorough review and highly appreciate the comments and suggestions, which significantly contributed to improving the content. RK is thankful to the Council of Scientific and Industrial Research, New Delhi, for a Senior Research Fellowship (SRF). RK would also like to thank Miss Alessia Garofalo for helping her with the Gaia data during VOSS 2018. DM gratefully acknowledges support provided by the BASAL Center for Astrophysics and Associated Technologies (CATA) through grant PFB-06, and the Ministry for the Economy, Development and Tourism, Programa Iniciativa Científica Milenio grant IC120009, awarded to the Millennium Institute of Astrophysics (MAS), and from project Fondecyt No. 1170121. HPS and RK thank the Indo-US Science and Technology Forum for funding the Indo-US virtual joint network centre on ‘Theoretical analyses of variable star light curves in the era of large surveys’. RK and DM are also very grateful for the hospitality of the Vatican Observatory, where this work was started.