I think this is referring to the figure on the cover of the issue of Science in which the detection was first reported. I think you will find that any ambiguit

I think this is referring to the figure on the cover of the issue of Science in which the detection was first reported. I think you will find that any ambiguities are resolved in one of the thirteen peer-reviewed publications on the detection available here: https://www.ligo.caltech.edu/page/detection-companion-papers https://www.ligo.caltech.edu/page/detection-companion-papers