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Fig. 4


Comparison between our FEROS chromospheric activities and those in Gray et al. (2006) is shown in the top panel. There is a large amount of scatter in this plot (0.11), which is significantly larger than the intrinsic rms we found from our calibration stars (0.04). However, there is no significant trend, as shown by the best fit straight line (solid line) compared to the dashed 1:1 relationship. The lower panel shows the same comparison but against the published values of Henry et al. (1996) where an offset is apparent. The offset only seems apparent for moderate to active stars.

This figure is made of several images, please see below:

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