Schematic representation of the three hypotheses for the origin of X7 studied in this work. (a) X7 formed from a stellar wind of a star during an episode of high mass loss such as a LBV phase. (b) X7 as the ejecta from a stellar merger via the EKL mechanism, where G3 is the merger product due to similar orbital motion. (c) X7 as the ejecta from a collision of a star with a field object such as a stellar-mass black hole or a Jupiter-mass object. Bear in mind that the representations are not to scale.