Orders and max deviation in pips

[Forex Trader]

Hi!

My MT4 shows the prices with 5 decimals.

My question is that if I enable maximum deviation on an order, let's say I choose 2, does that mean +- 0.0002 or +- 0.00002?

So the pip size there relates to the most insignificant 5th decimal or the "traditional" 4th one?

I ask this because even in the order window where the prices are shown, the 5th decimal is displayed with a much smaller size - and it confuses me.

Thanks!