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In Equation (16) of the paper you link to, $z$ is the observed redshift. In the first paragraph of section 2.2 The heart of the method is to use a measured redshift, z, to infer a velocity, v(z)


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With the Gaia Data Release 2, you can plot an HR diagram with a few million stars. From the Gaia website : The data can be accessed in the search tab, where you can specify the columns you want to display (phot_bp_mean_mag and phot_rp_mean_mag). There is a button at the bottom to export the results to a file on your computer. You can then plot one of the ...


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