Doubles centre line

Hi,when playing doubles and i'm serving down the middle of the table,is it a foul when any part of the ball crosses the centre line or does the whole of the ball need to be over the line before i loose the point.Who does the centre line belong to.

Hi Barry,

As long as some part of the ball touches the line it is a good serve.

 This is often difficult to tell since the ball is so small and the line so thin.