* altermod changes a model parameter, re-run
.model DMOD D(IS=1e-14)
V1 a 0 DC 0.7
R1 a d 100
D1 d 0 DMOD
.tran 1u 5u
.control
  run
  print v(d)[0]
  altermod DMOD IS=1e-11
  run
  print v(d)[0]          $ larger IS -> smaller forward drop
.endc
.end