Patent ID: 8661373

Claim:
A method, comprising: determining characteristic parameters that are characteristic of an intensity curve of radiation to be applied to a semiconductor wafer through a mask, in zones of structures to be formed on the wafer; for each of the zones, placing a measuring point in a multidimensional space having dimensions that correspond to the characteristic parameters, respectively, according to values of the characteristic parameters that are characteristic of the intensity curve in the zone; placing control points in the multidimensional space which are spread around an area delimited by endmost measuring points, so as to delimit an envelope surrounding the area; for each control point, defining a control structure having values of the characteristic parameters corresponding to the control point; and transferring the control structures to the semiconductor wafer using a process which involves a mask containing the control structures, the transferring including defining the control structures in or on the semiconductor wafer using the process that involves the mask.