Low-resolution ion spectra from mass 26 to 30 u/e for two different time periods. The mass resolution is insufficient to resolve CN⁺ from C₂H or HCN⁺ from C₂H at masses 26 and 27, respectively. In the top panel, clear evidence is shown that CO⁺ dominates mass 28 and HCO⁺ dominates mass 29. The inset shows a zoom-in for mass 29, the smallest peak. The error bars in the inset are dominated by the ion statistical uncertainties in the signal and uncertainties in the mass calibration are given as horizontal error bars. The bottom panel shows very little CO⁺ and there may be a contribution from C₂H to mass 29. The bottom panel also shows a possible peak at mass 30.