EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981 (Corrigendum)

¹ Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 København Ø, Denmark
e-mail: skottfelt@astro.ku.dk; uffegj@nbi.dk
² Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5-7, 1350 København K, Denmark
³ European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany
e-mail: dbramich@eso.org
⁴ SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews, KY16 9SS, UK
e-mail: rfiguera@eso.org; robertofiguera@gmail.com
⁵ Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
⁶ Qatar Foundation, PO Box 5825 Doha, Qatar
⁷ Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
⁸ Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno, via Ponte Don Melillo, 84084 Fisciano ( SA), Italy
⁹ Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
¹⁰ Istituto Internazionale per gli Alti Studi Scientifici (IIASS), 84019 Vietri Sul Mare ( SA), Italy
¹¹ Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, Bât. B5c, 4000 Liège, Belgium
¹² Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstr. 12-14, 69120 Heidelberg, Germany
¹³ Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
¹⁴ Main Astronomical Observatory, Academy of Sciences of Ukraine, vul. Akademika Zabolotnoho 27, 03680 Kyiv, Ukraine
¹⁵ Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
¹⁶ Korea Astronomy and Space Science Institute, 305-348 Daejeon, Republic of Korea
¹⁷ Jodrell Bank Centre for Astrophysics, University of Manchester, Oxford Road, Manchester M13 9PL, UK
¹⁸ Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
¹⁹ Perth Observatory, Walnut Road, Bickley, Perth, 6076 WA, Australia
²⁰ Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
²¹ Department of Physics, Sharif University of Technology, PO Box 11155-9161 Tehran, Iran
²² Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
²³ Max-Planck-Institute for Solar System Research, Max-Planck Str. 2, 37191 Katlenburg-Lindau, Germany
²⁴ Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA

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