Based on public data released from UVES Commissioning at the VLT Kueyen telescope (ESO, Paranal, Chile), the New Technology Telescope (ESO, La Silla, Chile) and the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities of Research in Astronomy, Inc. under NASA contract NAS 5-26555.

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On leave from the Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg.

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... parameters

The LSM is computationally identical to the standard $\chi^2$ -minimization, but it can be used to evaluate the uncertainties of the fitting parameters even in cases of correlated measurements. One must realize that the rebinning used in the data reduction procedure introduces a correlation between data point values (Levshakov et al. 2002).

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