Here you will find a description of the Agilent 8510c calibration kit file
format. The example file ck_lossy_lrm.ck is for an LRM calibration with the
101-190 Cascade impedance standard substrate. The 1.13 ps 200 um long thru
was characterized from a multi-line TLR calibration. The CPW dimensions are
50/25/200 um strip/slot/ground plane.