The partition functions χ(l) versus the scale (l/L) for the current density J_z calculated for the original data (circles), for the filtered data (squares), and for the smoothed (3 × 3, diamonds, and 5 × 5, triangles) data. This example refers to the snapshot taken on July 3, 2002 at 17:20 UT. Note that the first point at the smallest scale is identically 1 because of the normalization. Cancellation exponents κ obtained through the power-law fit for the four cases are indicated in the legend. The error bar is ±0.03 for all cases.