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*max(abs(fcor-fref))*is the maximum absolute difference of the measured, clock corrected frequency from the reference frequency for the 100-300 points at each reference. This maximum error seen in the test stayed below the 1:106line except for some points at frequencies over 200 KHz. The maximum error also generally stayed below the frequency discretization level, suggesting that after the clock is corrected, almost all of the remaining error is due to the discretization.
mean(fcor-fref) are the mean measurement error points at each frequency.
The The lower right plot shows the number of samples at each frequency. The tests were sometimes performed more than once, or with more than one input pulse counter, hence we usually have more than the 100 samples expected over 10 seconds.