NGC5486 as seen in the J-PLUS J0660 − r image (left panel). The panel shows a 53.3 arcmin² area. The red dot marks the position of an HII region observed spectroscopically by SDSS. The J-PLUS photospectrum and the SDSS spectrum of this region are shown in the right panel. The data sets are normalized to have the same r-band magnitude. The J0660 and J0378 fluxes are raised because of the Hα and [O II] nebular emission.