@davidhassell commented on this pull request.


> +==== Tie Point Dimension Mapping
+
+The **`tie_point_mapping`** attribute defined above associates 
+each interpolated dimension with its corresponding subsampled 
+ dimension and, if required, its corresponding 
+ __interpolation subarea dimension__ that defines the number of
+interpolation subareas which partition the interpolated dimension. 
+It is only required to associate an interpolated dimension  
+to an interpolation subarea dimension in the case that the interpolation 
+subarea dimension is spanned by an interpolation parameter variable, 
+as described in
+<<compression-by-coordinate-sampling-interpolation-parameters>>. 
+If an interpolation subarea dimension is provided then it must be 
+the second of the two named dimensions following the tie point index variable.
+
+Note that an interpolation subarea dimension has, by definition, the same size 
as the corresponding subsampled dimension, minus the number of continuous areas.

```suggestion
Note that the size of an interpolation subarea dimension is, by definition, the 
size of the corresponding subsampled dimension minus the number of continuous 
areas.
```

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