+@noindent @b{Important}: Please note that for these special tables,
+recalculating the table with @kbd{C-u C-c *} does only affect rows
+which are marked @samp{#} or @samp{*}, and named fields. The column
+formulas are not applied in rows with empty first field.
+
+The marking characters have the following meaning:
+@table @samp
+@item !
+The fields in this line define names for the columns, so that you may
+refer to a column as @samp{$Tot} instead of @samp{$6}.
+@item ^
+This row define names for the fields @emph{above} the row. With such
+a definition, any formula in the table may use @samp{$m1} to refer to
+the value @samp{10}. Also, named fields can have their own formula
+associated with them.
+@item _
+Similar to @samp{^}, but defines names for the fields in the row
+@emph{below}.
+@item $
+Fields in this row can define @emph{parameters} for formulas. For
+example, if a field in a @samp{$} row contains @samp{max=50}, then
+formulas in this table can refer to the value 50 using @samp{$max}.
+Parameters work exactly like constants, only that they can be defined on
+a per-table basis. Changing a parameter and then recalculating the
+table can be useful.
+@item #
+Fields in this row are automatically recalculated when pressing
+@key{TAB} or @key{RET} or @kbd{S-@key{TAB}} in this row. Also, this row
+is selected for a global recalculation with @kbd{C-u C-c *}. Unmarked
+lines will be left alone by this command.
+@item *
+Selects this line for global recalculation with @kbd{C-u C-c *}, but
+not for automatic recalculation. Use this when automatic
+recalculation slows down editing too much.
+@item
+Unmarked lines are exempted from recalculation with @kbd{C-u C-c *}.
+All lines that should be recalculated should be marked with @samp{#}
+or @samp{*}.
+@end table
+
+@node Named-field formulas, Editing/debugging formulas, Advanced features, Table calculations
+@subsection Named-field formulas
+
+A named field can have its own formula associated with it. In the
+example above, this is used for the @samp{at} field that contains
+the average result of the students. To enter a formula for a named
+field, just type it onto the buffer, preceded by @samp{:=}. Or use
+@kbd{C-u C-c =}. This equation will be stored below the table like
+@samp{$name=...}. Any recalculation in the table (even if only
+requested for the current line) will also update all named field
+formulas.