Methanol integrated intensity as a function of SiO integrated intensity. The top panels (a, b, c) respectively show the integrated 84, 95, and 104.3 GHz methanol emission vs. SiO (2−1) integrated intensity. The bottom panels (d, e, f) respectively show the integrated 84, 95, and 104.3 GHz methanol emission vs. SiO (5−4) integrated intensity. The orange and purple triangles represent the clumps hosting masers and maser candidates, respectively. The orange solid and black dashed lines depict the least-squares fitting results for methanol masers and all methanol detections, respectively.