Paper figures, README context, cohesive YAML masking comments

uniform_brain.yaml

@@ -40,14 +40,15 @@ inference:
       delete_kspace: false
       masking:
         name: FastMRIRandom
-        accelerations: [4]
-        # center_fractions: [0.06]
+        # Uncomment ONE pair (inference uses single-element lists only):
+        # accelerations: [2]
+        # center_fractions: [0.1]
         # accelerations: [6]
-        # center_fractions: [0.04]
+        # center_fractions: [0.06]
         # accelerations: [8]
+        # center_fractions: [0.04]
+        accelerations: [4]
         center_fractions: [0.08]
-        # accelerations: [2]
-        # center_fractions: [0.1]
       cropping:
         crop: null
         image_center_crop: false