Dunno, but at Heathrow on Deps there used to be 4 sides to each piece of jigsaw. In my day the parameters were:
Initial route separation
Speed group separation
WT spacing
CTOT
The Air Deps person would fiddle about with the 'pieces' to achieve the optimum departure rate then execute the plan with full-length or intersection departures.
If the initial route sep was 2 mins that was designed to achieve 5nm delivery to the ACC. Usually in reality 2 digital minutes worked ie. 91 seconds...
The WT 2 mins had to be the full 120 seconds and the WT 3 mins 180 seconds.
The CTOT was -5+10 and the speed group separation (could be fudged) from a chart...
Gonzo will probably tell me it's all different now with Big Brother watching...