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Fig. 10

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Correlation coefficients between H I and Av in the Perseus cloud. To confirm the H I velocities, we find the correlation coefficients between the H I beam brightness temperature and Av values, at each velocity slice. The y axis shows the correlation coefficient and the x axis shows the LSR velocity. This figure illustrates our second approach for determining the vCO - H I direction, as described in Sect. 4.1.

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