/*∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
∗ ∗
∗ This program is free software; you can redistribute it and/or modify ∗
∗ it under the terms of the GNU General Public License as published by ∗
∗ the Free Software Foundation; either version 2 of the License, or ∗
∗ (at your option) any later version. ∗
∗ ∗                                                                     * *
* *                   Email : s.gill@keele.ac.uk                        * *
* *                   github : samgill844                               * *
∗ ∗                                                                     * *
∗ Acknowledgments:                                                      * *
* The equations in the section "Keplerian equations" is ported from     * *
* the lightcurve model "ellc" (Maxted 2016), as is the function in      * *
* the "Radial velocity equations" section.                      
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