Density scatter plots of brightness temperature at 3.6 mm at resolutions of 0.2′′, 0.4′′, 1′′, and 4′′ versus gas temperature T_gas taken at the effective formation heights. Darker color indicates more pixels in the bin. The data are restricted to the locations of strong magnetic field (| B | ≥ 30 G) at the effective formation height. Red contours enclose 95% of the selected pixels.