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ecmwf-lab · Mar 23, 2024 · b3e4363 · b3e4363
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diff --git a/docs/building/handling_missing_dates.rst b/docs/building/handling_missing_dates.rst
@@ -0,0 +1,3 @@
+########################
+ Handling missing dates
+########################
diff --git a/docs/building/handling_missing_values.rst b/docs/building/handling_missing_values.rst
@@ -0,0 +1,3 @@
+#########################
+ Handling missing values
+#########################
diff --git a/docs/building/naming_variables.rst b/docs/building/naming_variables.rst
@@ -0,0 +1,18 @@
+.. _naming-variables:
+
+##################
+ Naming variables
+##################
+
+***************
+ rename filter
+***************
+
+The rename filter is used to rename variables in a dataset.
+
+*************************
+ remapping output option
+*************************
+
+The remapping output option is used to specify the output dataset for
+the remapping operation.
diff --git a/docs/building/sources/mars.rst b/docs/building/sources/mars.rst
@@ -14,5 +14,26 @@ the MARS language specification.
    mars:
        levtype: sfc
        param: [2t, msl]
+       grid: [0.25, 0.25]
+
+Data from several levels types must be requested in separate requests,
+with the `join` key.
+
+.. code:: yaml
+
+   join:
+
+    - mars:
+        levtype: sfc
+        param: [2t, msl]
+        grid: [0.25, 0.25]
+
+    - mars:
+        levtype: pl
+        param: [u, v]
+        grid: [0.25, 0.25]
+
+See :ref:`naming-variables` for information on how to name the variables
+when mixing single level and multi-levels variables in the same dataset.
 
 .. _mars language specification: https://confluence.ecmwf.int/display/UDOC/MARS+user+documentation
diff --git a/docs/index.rst b/docs/index.rst
@@ -58,6 +58,9 @@ models from existing recipes but with their own data.
    building/introduction
    building/sources
    building/filters
+   building/naming_variables
+   building/handling_missing_dates
+   building/handling_missing_values
 
 *********
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