updated perturbations doc

docs/building/sources/perturbations.rst

@@ -48,14 +48,11 @@ members
 center
    A :ref:`reference <yaml-reference>` to the new center requested.
 
+Examples
+
 .. literalinclude:: yaml/perturbations.yaml
    :language: yaml
 
-In this example, the `perturbations` function is applied using two
-:ref:`references <yaml-reference>` : The strings `members_source` and
-`center_source` are arbitrary keys that are used to reference the
-elements in `data_sources`.
-
 .. _convective precipitation: https://codes.ecmwf.int/grib/param-db/?id=143
 
 .. _ensemble forecasting: https://www.ecmwf.int/en/elibrary/75394-ensemble-forecasting

docs/building/sources/yaml/perturbations.yaml

@@ -1,22 +1,24 @@
 data_sources:
   members_source:
-    class: ea
-    expver: "0001"
-    grid: 20.0/20.0
-    levtype: sfc
-    param: [10u, 10v, 2t]
-    type: an
-    stream: enda
-    number: [1, 2, 3, 4, 5, 6, 7, 8, 9]
+    mars:
+      class: ea
+      expver: "0001"
+      grid: 20.0/20.0
+      levtype: sfc
+      param: [10u, 10v, 2t]
+      type: an
+      stream: enda
+      number: [1, 2, 3, 4, 5, 6, 7, 8, 9]
 
   center_source:
-    class: ea
-    expver: "0001"
-    grid: 20.0/20.0
-    levtype: sfc
-    param: [10u, 10v, 2t]
-    type: an
-    stream: oper
+    mars:
+      class: ea
+      expver: "0001"
+      grid: 20.0/20.0
+      levtype: sfc
+      param: [10u, 10v, 2t]
+      type: an
+      stream: oper
 
 input:
   perturbations: