Specify the tolerance of fitting error between the box model which is specified at [Upper Surface Size] and features in an image. The default value is 5 pixels. The range of this item changes according to [Search Density]. The minimum value is 0.1 / (the value specified at [Search Density]). The maximum value is 5.0 / (the value specified at [Search Density]). Setting a large value enables the tool to find the target in images that are greatly deviated in geometry. However, the larger the value is, the more likely inaccurate location becomes.