A method and apparatus for profiling a heap. The glass composition has a base portion including 65 to 75 weight percent SiO2, 10 to 20 weight percent Na2O, 5 to 15 weight percent CaO, 0 to 5 weight percent MgO, 0 to 5 weight percent Al2O3, and 0 to 5 weight percent K2O. Impact of re-aligning upon each vector in the second dimension of the two-dimensional compressed data set is determined while the two-dimensional compressed data set remains compressed. The invention further includes methods of forming radiation-patterning tools, and the radiation-patterning tools themselves.