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+THE OBSERVATION SECTION
+    
+    The  observation  section  is used to assign names to columns in the
+    observations files, and to optionally, associate error columns  with
+    the named columns.
+
+    The  observations  section  begins  with  the  keyword  observation, 
+    followed by any number of name and error (name) column associations.
+    
+    Syntax
+        observation
+        
+        name number
+        
+        error(name)  number
+    
+    The first declaration creates a name column number association.   It
+    consists  of  a  name  followed by a column number. The name becomes
+    the variable name for that column.
+    
+    The  second  declaration  creates  an  error  (name)  column  number 
+    association.   It  starts with the keyword error, followed by a name
+    in brackets, and a column number.  The name must be the name  of  an
+    input  column  previously  declared in the observation section.  The
+    error declarations are optional.
+    
+    The column number must be a decimal integer greater two,  since  the
+    first  column  of  the  observations file is reserved for a matching
+    name.  This name is used to match objects in the  observations  file
+    with objects in the catalog file.
+    
+    Example
+        # Sample observation section for the UBV system.
+        
+        observation
+        
+        u           2
+        error(u)    3
+        b           4
+        error(b)    5
+        v           6
+        error(v)    7
+        x           8