objref ic_hold
access soma[0]
ic_hold = new IClamp(0.5)
ic_hold.del = 0
ic_hold.dur = tstop
ic_hold.amp = PARAM_ic_hold_amp

objref ic_step
ic_step = new IClamp(0.5)
ic_step.del = 1000
ic_step.dur = 2000
ic_step.amp = PARAM_ic_step_amp