stimulus duration of add_noise_step is longer than informed

[AurelienJaquier]

Here is what I gave to BlueCelluLab:

cell.add_noise_step(cell.soma, 0.5, delay=1000.0, duration=43.0, mean=0.2, variance=0.0, seed=20)
sim.run(1600, cvode=False, dt=0.025, v_init=-55, celsius=35)

but here is the output I got:

Even though I gave a short duration (43 ms), BlueCelluLab make it last until the end of the simulation.