Spurious rate, the number of spurious detections as a fraction of the number of secondaries injected, as a function of the magnitude difference between the primary and the injected secondary. Top: primary sources in the G magnitude range 13.5–15.5. Bottom: primary sources in the G magnitude range 16.0–18.0. The rates in both the image-subtraction and vanilla pipelines are shown. The shaded areas enclose the 1σ errors in the spurious rate. We see that there is an increase in the chance of a spurious detection, if there is a low magnitude difference companion.