update voxel graphic

Volume-Data-Suite · Dec 3, 2023 · b1d4422 · b1d4422
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diff --git a/src/about_volume_data.md b/src/about_volume_data.md
@@ -4,9 +4,9 @@
 
 A voxel is like a three-dimensional pixel that represents a value on a regular grid in three-dimensional space. It is analogous to a pixel, which represents a value on a regular two-dimensional space, like a 2D image.
 
-| <img src="images/voxels.svg" alt="Voxels" width="200"/> 
+| <img src="images/voxels_large.svg" alt="Voxels"/> 
 | :--------------------------------------:
-| _3D voxel grid with a highlighted voxel_
+| _3D voxel grid with two highlighted voxel_
 
 When dealing with 3D MRI or 3D CT images, a voxel value usually represents a itensity value (also known as ISO value).