  Two quantities quantifying uncertainty relations are examined. In
J.Math.Phys. 48, 082103 (2007), Busch and Pearson investigated the limitation
on joint localizability and joint measurement of position and momentum by
introducing overall width and error bar width. In this paper, we show a simple
relationship between these quantities for finite-dimensional systems. Our
result indicates that if there is a bound on joint localizability, it is
possible to obtain a similar bound on joint measurability. For
finite-dimensional systems, uncertainty relations for a pair of general
projection-valued measures are obtained as by-products.
