Merge pull request #10 from rhattersley/review-chp6

Chapter 6 fixes

ch06.adoc

@@ -17,7 +17,7 @@ element of an axis. This is particularly useful for discrete axes
 observational data from a number of observing stations, it may be
 convenient to provide the names of the stations as labels for the
 elements of the station dimension (<<time-series-data>>).
-      <<Example H.1.1>> illustrates another application for labels.
+      <<example-h.1>> illustrates another application for labels.
 
 
 Character strings labelling the elements of an axis are regarded as
@@ -33,29 +33,16 @@ string-valued auxiliary coordinate variables. The **`coordinates`** attribute
       coordinate variable (see <<scalar-coordinate-variables>>)
 
 
-.
-====
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-
-====
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-
 [[geographic-regions]]
 ==== Geographic Regions
 
-When data is representative of geographic regions which can be identified by names but which have complex boundaries that cannot practically be specified using longitude and latitude boundary coordinates, a labeled axis should be used to identify the regions. We recommend that the names be chosen from the list of link:$$http://cf-pcmdi.llnl.gov/documents/cf-standard-names/standardized-region-names$$[standardized region names] whenever possible. To indicate that the label values are standardized the variable that contains the labels must be given the **`standard_name`** attribute with the value region .
+When data is representative of geographic regions which can be identified by names but which have complex boundaries that cannot practically be specified using longitude and latitude boundary coordinates, a labeled axis should be used to identify the regions. We recommend that the names be chosen from the list of link:$$http://cf-pcmdi.llnl.gov/documents/cf-standard-names/standardized-region-names$$[standardized region names] whenever possible. To indicate that the label values are standardized the variable that contains the labels must be given the **`standard_name`** attribute with the value `region`.
 
 .Northward heat transport in Atlantic Ocean
 ====
 
-----
 Suppose we have data representing northward heat transport across a set of zonal slices in the Atlantic Ocean. Note that the standard names to describe this quantity do not include location information. That is provided by the latitude coordinate and the labeled axis:
+----
 dimensions:
   times = 20 ;
   lat = 5
@@ -94,8 +81,8 @@ In some situations a dimension may have alternative sets of coordinates values.
 .Model level numbers
 ====
 
-----
 Levels on a vertical axis may be described by both the physical coordinate and the ordinal model level number.
+----
 float xwind(sigma,lat);
   xwind:coordinates="model_level";
 float sigma(sigma); // physical height coordinate