Update README.md

README.md

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 The SPIDER dataset contains (human) lumbar spine magnetic resonance images (MRI) and segmentation masks described in the following paper:
 
-- **van der Graaf, J.W., van Hooff, M.L., Buckens, C.F.M. et al. *Lumbar spine segmentation in MR images: a dataset and a public benchmark.*
-  Sci Data 11, 264 (2024). https://doi.org/10.1038/s41597-024-03090-w**
+- van der Graaf, J.W., van Hooff, M.L., Buckens, C.F.M. et al. *Lumbar spine segmentation in MR images: a dataset and a public benchmark.*
+  Sci Data 11, 264 (2024). https://doi.org/10.1038/s41597-024-03090-w
 
 Original data are available on [Zenodo](https://zenodo.org/records/8009680). More information can be found at [SPIDER Grand Challenge](https://spider.grand-challenge.org/).
 
-![Example MRI Image](docs/ex1.png)
+<figure>
+  <img src="docs/ex1.png" alt="Example MRI Image" style="height:300px;">
+  <figcaption>Example MRI scan (at three different depths)</figcaption>
+</figure>
 
-![Example MRI Image with Segmentation Mask](docs/ex2.png)
+<figure>
+  <img src="docs/ex2.png" alt="Example MRI Image with Segmentation Mask" style="height:300px;">
+  <figcaption>Example MRI scan with segmentation masks</figcaption>
+</figure>
 
 ## Getting Started