The simout structure has simout.signals, simout.time and simout.blockName fields. The simout.signals field also has a simout.signals.values field, which holds your sampled data.
Further, if you selected 'Structure With Time' in your 'To Workspace' block, then the time field will be populated and the easiest way to plot it is like this:
>> plot(simout.time,simout.signals.values)
Otherwise, simout.time is left empty and you should just use the tout vector for your time variable like this:
>> plot(tout,simout.signals.values)
