Spectroscopic properties of SDSS J1011+5442 in the dim state. The top left panel shows the SDSS spectrum (solid dark green line) and the determined best descriptions of host galaxy contributions (solid blue line) and AGN continuum emissions (dashed red line). The solid red line shows the sum of host galaxy contributions and AGN continuum emissions. The bottom left panel shows the spectrum after subtraction of the host galaxy contributions and AGN continuum emissions. The horizontal dashed red line marks f_λ = 0. The top middle panel shows the spectrum around Hβ (solid dark green line) and the best-fitting results (solid red line) after subtraction of the host galaxy contributions. The dashed blue lines show the determined Gaussian components of narrow Hβ and [O III] doublet. The bottom middle panel shows the residuals. The horizontal solid and dashed red lines mark residuals = 0, ±1. The right panels show the results for emission lines around Hα, similar as in the middle panels. In the top right panel, the dashed blue lines show the determined Gaussian components in the narrow emission lines, and the solid blue line shows the determined broad Hα line.