Circuit: * D:\ruark\projects\Picoammeter\Ionization Chamber\ion_rad.asc Direct Newton iteration for .op point succeeded. Ignoring empty pin current: Ix(u1:1) Ignoring empty pin current: Ix(u1:2) Ignoring empty pin current: Ix(u1:1) Ignoring empty pin current: Ix(u1:2) .step rf=1e+008 Heightened Def Con from 0.00153592 to 0.00153592