Improve formatting of figures.

The previous way had the top of the second picture run into the bottom
of the first one. Since both are meshes, it was hard to see what was
going on.

diff --git a/examples/step-28/doc/results.dox b/examples/step-28/doc/results.dox
index 63c6f6f6603d5ac0d8d425dbb9d2c1980c54bc24..d4b55f95864b6f45c7a4299e7248c77f13d6474f 100644 (file)
--- a/examples/step-28/doc/results.dox
+++ b/examples/step-28/doc/results.dox
@@ -70,20 +70,20 @@ The meanings of columns are: number of mesh iteration, numbers of degrees of
  freedom of fast energy group, numbers of DoFs of thermal group, converged 
 k-effective and the ratio between maximum of fast flux and maximum of thermal one.
 
-The grids of fast and thermal energy groups at mesh iteration #9 are shown 
-in following figure.
+The grids of fast and thermal energy groups at mesh iteration #9 look
+as follows:
 
-<img src="https://www.dealii.org/images/steps/developer/step-28.grid-0.9.order2.png" alt="">
-
-<img src="https://www.dealii.org/images/steps/developer/step-28.grid-1.9.order2.png" alt="">
+<img width="400" src="https://www.dealii.org/images/steps/developer/step-28.grid-0.9.order2.png" alt="">
+&nbsp;
+<img width="400" src="https://www.dealii.org/images/steps/developer/step-28.grid-1.9.order2.png" alt="">
 
 We see that the grid of thermal group is much finer than the one of fast group. 
 The solutions on these grids are, (Note: flux are normalized with total fission
 source equal to 1)
 
-<img src="https://www.dealii.org/images/steps/developer/step-28.solution-0.9.order2.png" alt="">
-
-<img src="https://www.dealii.org/images/steps/developer/step-28.solution-1.9.order2.png" alt="">
+<img width="400" src="https://www.dealii.org/images/steps/developer/step-28.solution-0.9.order2.png" alt="">
+&nbsp;
+<img width="400" src="https://www.dealii.org/images/steps/developer/step-28.solution-1.9.order2.png" alt="">
 
 Then we plot the convergence data with polynomial order being equal to 1,2 and 3.