ltspice step decade code example
Example: spice param logarithmic
By octave
.step oct v1 1 20 5
.step oct param R 1 20 5
By decade
.step dec param parName LowLimit HighLimit stepsPerDecade
By octave
.step oct v1 1 20 5
.step oct param R 1 20 5
By decade
.step dec param parName LowLimit HighLimit stepsPerDecade