add space

user-doc/tutorials/a-master-ISDD-2.txt

@@ -400,7 +400,8 @@ gnuplot> p "ffpsi.dat" u 1:2 w lp
 
 You can also compare the free energies as a function of \f$ \phi \f$ calculated:
 - directly from the metadynamics bias potential using \ref sum_hills as done in \ref master-ISDD-2-ex-2;
-- using the reweighting procedure introduced in this exercise 
+- using the reweighting procedure introduced in this exercise. 
+
 The results should be identical (see Fig. \ref master-ISDD-2-fescomp-fig).
 
 \anchor master-ISDD-2-fescomp-fig