How to design a butterworth bandstop filter?

How would I design a filter to get rid of white noise as can be seen on the attached image.

[b,a] = butter(2,[0.2 0.3],'stop'); Not sure on what the range of frequency would be as it requires to be between 0 and 1

B = filter(b,a,A);

[Jan]

There is no attached image. Please try to attach it again.

[Star Strider]

White noise is by definition broadband noise, so a filter of any design would not completely get rid of it.