Top left: I − (R − I); top right: I − (I − J); bottom left: I − (I − K); and bottom right: J − (J − K) colour-magnitude diagrams of optically selected candidates (points) from the TLS and 2MASS/UKIDSS surveys; the propermotion candidates are indicated by filled circles. In all CMDs, we show 625 Myr BT-Settl isochrones shifted to the distance of the Hyades cluster (m − M = 3.33) as solid lines. The vertical line labelled with stellar mass (M⊙ ) is the mass scale according to this model. The two dashed lines outline the selection area (see text). The upper horizontal line at I = 18.1 shows the stellar/substellar boundary and the lower line indicates the lithium burning limit. The BT-Settl isochrone in the J − (J − K) CMD agrees well with the colour indices of the faintest member candidates.
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