... observations

Tables 4-7 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/427/371

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... relation

This method is well known to compute the derivative of a function f at the second order: $f(x+\varepsilon)-f(x-\varepsilon)=2\varepsilon f^\prime(x)+O(\varepsilon^3)$.

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... gives

Tables 4-7 are only available in electronic form at the CDS.

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