Muon parameters update

src/ctapipe/containers.py

@@ -1193,9 +1193,13 @@ class MuonParametersContainer(Container):
         nan, "Sum of the pixel charges inside the integration area around a ring"
     )
     intensity_outside_ring = Field(nan, "Sum of the pixel charges outside the ring")
-    n_pixels_in_ring = Field(nan, "Number of pixels in the ring")
+    n_pixels_in_ring = Field(
+        nan,
+        "Number of pixels inside the ring integration area that passed the cleaning",
+    )
     mean_intensity_outside_ring = Field(
-        nan, "Mean intensity of pixels outside the ring"
+        nan,
+        "Mean intensity of pixels inside the region limited by ring integration width and outer ring width.",
     )
     standard_dev = Field(
         nan * u.deg,

src/ctapipe/image/muon/features.py

@@ -200,11 +200,13 @@ def ring_size_parameters(
     ring_intensity: float
         Sum of the p.e. inside the integration area of the ring
     intensity_outside_ring: float
-        Sum of the photons outside the ring integration area that passed the cleaning
+        Sum of the p.e. outside the ring integration area that passed the cleaning
     n_pixels_in_ring: int
         Number of pixels inside the ring integration area that passed the cleaning
     mean_intensity_outside_ring: float
-        Mean intensity of the pixels outside the ring, but still close to it
+        Mean intensity of the pixels outside the integration area of the ring,
+        and restricted by the outer ring width, i.e. in the strip between
+        ring integration width and outer ring width.
     """
 
     dist = np.sqrt((pixel_x - center_x) ** 2 + (pixel_y - center_y) ** 2)