Distribution of detection number and detection rate of three methanol transitions under different FWZP of SiO (2−1) emission. The labels for the detection numbers are on the left side, while those for the detection rates are on the right side. The red, blue, and green bins present the detection numbers of methanol emission at 84, 95, and 104.3 GHz, respectively, where the solid and hatched parts represent masers and maser candidates. The red, blue, and green triangles indicate the detection rates of methanol emission at 84, 95, and 104.3 GHz.