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Fig. 4

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HR diagram showing the observational error boxes for HD 122563 (left) and Gmb 1830 (right). Both figures show stellar models that pass through the error boxes which allow us to determine the stellar model properties and their uncertainties. Each panel shows the adopted central models (with arrows) obtained by considering the HR and metallicity constraints. Other models are also indicated to highlight the parameter uncertainties and correlations. Refer to Sects. 4.3.1 and 4.3.2 for details.

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