Total line flux maps of the nine brightest emission lines in Th 28 over the J, H, and K bands. Each map shows the total line flux integrated over all the velocity frames where emission is detected. The star gives the position of the central source, calculated from the continuum (stellar) profile. The coloured arrows indicate the direction of the blue and red lobes. The vertical log-scale shows the fluxes in erg s⁻¹ cm⁻².