Multi-port feed simulations were carried out also in the other vessels ( ). The time-scale refers to the time required to reduce the concentration's standard deviation down to 5 % relative to mean. Simulated rate is the factor by which the time-scale has been divided compared with a single feed point at the top. Corresponding theoretical rates (section 3.3) predicted by the dispersion model are shown for reference. ) 4.9 s after pulse addition of tracer. SD stands for standard deviation relative to mean.