A new instrument for electrical-mobility based size segregation of particles at high resolution is described. The look-ahead delta-sigma modulators can also combine the pruning techniques with a reduction in the amount of processing by simplifying the computations used to generate quantizer output values. Expansion strut pairs include expansion strut pair first and second corners formed where the joining strut couples the first and second expansion struts. Improved tissue webs produced are also disclosed having useful sets of physical and geometrical properties, such as a pattern densified network- and a repeating pattern of protrusions having asymmetrical structures. Alternatively, the insert is not used or the insert does not include the legs.