ROSINA DFMS m∕Q = 28 to 30 Da/e spectra in log scale top to bottom, measured during the slew on 31 July 2015, 16:22:27 (ESA Planetary Science Archive (PSA) filename and DFMS detector row: MC_20150731_162059567_M0222.TAB, row B), 16:22:55 (MC_20150731_162127567_M0222.TAB, row B), and 16:23:23 UTC (MC_20150731_162155567_M0222.TAB, row B) at off-nadir angles decreasing from 150 to 148 degrees (see Fig. 2). Indicated on the x-axis on top is the m∕Q of a suite of species. Vertical lines mark the exact masses of species of interest (parents and fragments), i.e., ²⁸Si with the minor isotopes ²⁹Si and ³⁰Si as well as where ²⁸SiH, ²⁹SiH, and ²⁸SiH₂ would be expected. We note that except for ²⁸Si, the top labels do not include the mass number of the major isotope of an element, e.g., ¹²C, ¹⁴N, ¹⁶O, etc.