Spectral types, accretion rates and disk dust masses of η Cha. Top: accretion rate vs. spectral type. There is a lack of significant correlations between these quantities. Bottom: circumstellar dust mass derived according to Eq. (1) vs. accretion rate. For comparison, the objects in the list from Manara et al. (2023) are shown in gray. The total disk mass would depend on the gas-to-dust ratio. APEX flux and mass upper limits are shown as inverted triangles. The red line corresponds to the model fitted by Manara et al. (2016). The accretion rates are taken from the literature (see Table A.1). For each object we show the individual measurements (small symbols) together with the average rate (large symbols). An additional color ring is added to specify the type of disk according to the classical SED classification.