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The above shows that the clock on flux agrees to within a maximum 52 microseconds with each DSM, as indicated by the "Last sample" value in brackets, which is the estimated offset of the DSM time from the time on flux.
The second character should be '*' (chrony on flux is sync'd to this server) or '+' (good server). Sometimes I've seen You may also see '-' (lately recently on 100m for some reason) indicating chrony does not have a high opinion of its time information, relative to the others.
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