Understanding the function of this particular 9 patch image

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please check out this link:

This is a tool to generate 9 patch images for splash screen in ionic framework, now from my understanding of 9 patch image , if there is a black line , it means that the image is allowed to stretch in that region.

However in the tool dots are mentioned.

enter image description here

Can you please help me understand what that means. My splash screen used to be a single png file with a logo at the center but was a bit distorted, Now after I have implemented 9 patched images, the distortion has gone but the logo has become quite small.

Any idea why this is happening ?

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