minor typesetting corr

Doc/UserManual/Multilayers.tex

@@ -219,7 +219,7 @@ of the perturbative potential~(\ref{EChiGraded}),
 restricted to one layer.
 
 To alleviate later calculations,
-we now number the four DWBA terms from 1 to 4,
+we now number the four DWBA terms from 1 to~4,
 and define the corresponding wavenumbers and amplitude factors and as
 \begin{equation}
   \begin{array}{l@{\hspace{2em}}l}