Test update Wang figure again

episodes/01-xrays.md

@@ -38,7 +38,7 @@ In recent years, organisations like the [National Institutes of Health](https://
 
 The following figure is from a study by [Xiaosong Wang et al](https://openaccess.thecvf.com/content_cvpr_2017/papers/Wang_ChestX-ray8_Hospital-Scale_Chest_CVPR_2017_paper.pdf). It illustrates eight common diseases that the authors noted could be be detected and even spatially-located in front chest x-rays with the use of modern machine learning algorithms.
 
-![Chest X-ray diseases](/fig/wang_et_al.png){: width="600px"}
+![Chest X-ray diseases](/fig/wang_et_al.png){width="600px",alt="alttest"}