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In all cases the confidence interval for the slope includes unity, indicating that the analyses are accurate and consistent over the range covered.Also the confidence interval for the intercept includes zero, from which it is inferred that in no case is there a blank dependent on the amount of constituent.The estimated standard deviation for bismuth by difference would be expected to be somewhat larger than reported here, because it should contain all the errors of the other determinations. The fact that it is not larger suggests the presence of compensating errors.However, because the precision was satisfactory, no effort was made to isolate these errors.

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