Temperature/density-gradient model including an additional inner hot 1400 K ring component. Top: SED observations (black and gray symbols), model SEDs (black solid line: model including the 1400 K ring component; black dotted line: model without the 1400 K component), and correlated fluxes (yellow, green, and blue; see Paper I for more details). The different colors (see top color bar) correspond to different spatial wavelengths measured in units of the dust sublimation radius R_in. Bottom: new NIR visibilities (purple symbols) and our MIR visibilities from Paper I (the symbols with colors from green to red correspond to 8.5 to 13 μm; see color-coding bar; note that the spatial frequency is given in units of cycles per R_in). The solid and dashed lines are the visibilities of the temperature/density-gradient model including an additional inner 1400 K ring. The red, green, and purple lines are the model visibilities at 13, 8.5, and 2.2 μm, respectively (solid lines: model curves for the PA along the equatorial axis; dashed line: along the polar direction; see Paper I). The dotted lines are the visibilities and SED of the same temperature/density-gradient model, but without an inner hot 1400 K ring component.