The User's guide is updated following the previous commit

docs/users_guide.log

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docs/users_guide.tex

@@ -457,9 +457,11 @@ give significant speedup \\
 \hline
 \emph{accum\_end} & The date and time for finishing accumulating fluxes \\
 \hline
-\emph{ngrid\_out} & the number of output levels for vertical water temperature profiles: -1 -- use numerical grid levels; $> 0$ -- use ngrid\_out levels (in meters) given below \\
+\emph{ngrid\_out} & the number of output levels for vertical water temperature profiles, the depths of levels (in meters, in respect to water surface) are given below \\
 \hline
-\emph{ngridsoil\_out} & the number of output levels for vertical soil temperature profiles: -1 -- use numerical grid levels; $> 0$ -- use ngridsoil\_out levels (in meters) given below \\
+\emph{ngridice\_out} & the number of output levels for vertical ice temperature profiles, the depths of levels (in meters, in respect to ice surface) are given below \\
+\hline
+\emph{ngridsoil\_out} & the number of output levels for vertical soil temperature profiles, the depths of levels (in meters, in respect to sediments surface) are given below \\
 \hline
 \emph{rtemp} & the number of locations for scalars (temperature, CH$_4$, ...) output, followed by triples (x,y,z) of respective coordinates; x and y relative to a lake center, and z measured from the lake top \\
 \hline