SFG sample selected by the emission line diagnostic and radio morphology. The y-axis is the equivalent width of Hα in the nuclear region measured from MaNGA spectra. The x-axis is the distance to the division line in the BPT diagram (Equation 1 in Kauffmann et al. 2003), based on the [N II]λ6585/Hα and [O III]λ5008/Hβ ratios. Negative and positive ΔBPT mean that galaxies locate in the star-forming region and AGN region in the BPT diagram, respectively. This Hα-ΔBPT diagram can classify the galaxies into SFG, AGN, and quiescent galaxies. Our pure SFG sample is plotted as stars and color-coded by their radio luminosities. The background grayscale contour is the distribution of the whole MaNGA sample.