error message for tropicalize

tropical.pl

@@ -227,8 +227,11 @@ subst_deg_and_vars(V, Vars, Ai, A) :-
 % TODO use get_degree for numbers
 
 subst_deg_and_vars(E, _, _, _) :-
-  format_to_atom(A, "We do not understand the kinetic term ~p~n", [E]),
-  throw(error(A)).
+  throw(error(unknown_kinetic_term(E))).
+
+
+prolog:message(error(unknown_kinetic_term(E))) -->
+  ['We do not understand the kinetic term ~p~n'-[E]].
 
 
 % split_pos_neg_and_subst(+O, +Vars, ?Ai, ?Pos, ?Neg)
@@ -456,8 +459,9 @@ tropicalize :-
     tropical_partial,
     number,
     Partial,
-    'Nubmer of a variable to ignore for equilibration (0 to ignore none, -1
-      to ignore all unbalanced)'
+    'Number of a variable (as displayed by \\command{list_molecules/0} plus 1)
+      to ignore for equilibration (0 to ignore none, -1 to ignore all
+      unbalanced)'
   ),
   option(
     tropical_denominator,