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Fig. 5


ISIS spectra (solid black line) together with best fit synthetic spectra (solid red line) in the Ca ii region for six different EMP, J04010512 (upper-left) with [Fe/H] = −3.6, J0140+2344 (middle-left) with [Fe/H] = −3.6, J0105+4615 (lower-left) with [Fe/H] = −3.7, J1642+4430 (upper-right) with [Fe/H] = −4.0, J0758+6539 (middle-right) with [Fe/H] = −3.0, J0446+1137 (lower-right) with [Fe/H] = −3.2, after the ISIS/WHT analysis. The ISM contribution in calcium K and H lines are added to the synthetic spectra (dashed-black line) calculated with SYNTHE.

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