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Fig. 4

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Two-colour diagram (J − K) vs. (K − L′) for our sample stars, divided into three regions related to three different colour-mbol relations. See Fig. 5. The open circles give the intrinsic colours for giants of spectral type K0, K3, M1, and M5 from Bessell & Brett (1988), respectively. The large filled boxes mark the colours of black-body SEDs from 3500 to 1500 K.

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