How to remove the middle part of a graphic

I have a graphic and i have to remove all points which are (in the axis y) between 25% and 75% of the height. In general points which are in the middle part of this graphic. In other words i have to remove the central part of which is between 25% and 75% of the height (axis y) How can i do this?

Thanks very much in advance!!!

Answer 1

[Yatin]

Hi, You can try setting the values between 25% to 75% to NaN. This might do the thing.

Answer 2

[Image Analyst]

Try calling xlim and ylim.