.options probe post csdf
to generate non-binary output files. After a header, the body of a CSDF
.tr* file is of this form:
#C 1.0000000E-12 3 0.00000 5.00000 0.00000
#C 2.0000000E-12 3 0.00000 5.00000 0.00000
#C 4.0000000E-12 3 0.00000 5.00000 0.01037
...