problems with bwareaopen in segmenting

hello, I am using bwareaopen to remove a part of the image i dont want. Here is my code
a=imread('C:\Users\S\Desktop\project\A data\figure10.jpg');
a=im2bw(a);
az=bwareaopen(a,500);
imshow(az);
But i have been unsuccessful. If anyone can help me with this, I will be greateful. Thank you
This is my input image:
Thank you.

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2017-7-13

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