How to start a system with zero power?

[arcuspilot]

I'd like a system (cloaking in this case) to be available on my ship to buy but not to start with.

Could somebody let me know what value to edit to achieve this please?
The ship in question is already mentioned in this forum : http://www.ftlgame.com/forum/viewtopic.php?f=12&t=14014

[kartoFlane]

Just add a "start=false" element before the img element.
So the system's tag should look like this:
<cloaking power="#" room="#" start="false" img="..."/>

[DryEagle]

if a ship starts with a system it must have at least 1 power (be active).
otherwise you have to make it buyable in shops only.
set it to rarity 1 and it will show up in every shop that sells systems.