diff --git a/book.org b/book.org
index f2d332f..5079d00 100644
--- a/book.org
+++ b/book.org
@@ -1026,6 +1026,7 @@ We have drastically cut the time we initially spent on mandatory assignments by
 #+NAME: tab:usefweworkload
 | Task                                | Estimated workload (hours) |
 |-------------------------------------+----------------------------|
+| <l>                                 |                        <r> |
 | Lectures                            |                         60 |
 |-------------------------------------+----------------------------|
 | Mandatory assignments               |                        540 |
@@ -1966,14 +1967,15 @@ Table\nbsp{}[[tab:passfailcoursestatistics]] summarizes some statistics on the c
 #+CAPTION: The courses are taken by different student cohorts at different faculties and differ in structure, lecturers and teaching assistants.
 #+CAPTION: The number of tries is the average number of solutions submitted by a student per exercise they worked on (i.e. for which the student submitted at least one solution in the course edition).
 #+NAME: tab:passfailcoursestatistics
-|   |       year | students | # ex. | solutions       | tries | pass rate |
-|---+------------+----------+-------+-----------------+-------+-----------|
-| A | 2016--2017 |      322 |    60 | 167\thinsp{}675 |  9.56 |    60.86% |
-| A | 2017--2018 |      249 |    60 | 125\thinsp{}920 |  9.19 |    61.44% |
-| A | 2018--2019 |      307 |    60 | 176\thinsp{}535 | 10.29 |    65.14% |
-| B | 2016--2017 |      372 |   138 | 371\thinsp{}891 |  9.10 |    56.72% |
-| B | 2017--2018 |      393 |   187 | 407\thinsp{}696 |  7.31 |    60.81% |
-| B | 2018--2019 |      437 |   201 | 421\thinsp{}461 |  6.26 |    62.47% |
+|     | year       | students | # ex. |       solutions | tries | pass rate |
+|-----+------------+----------+-------+-----------------+-------+-----------|
+| <l> | <l>        |      <r> |   <r> |             <r> |   <r> |       <r> |
+| A   | 2016--2017 |      322 |    60 | 167\thinsp{}675 |  9.56 |    60.86% |
+| A   | 2017--2018 |      249 |    60 | 125\thinsp{}920 |  9.19 |    61.44% |
+| A   | 2018--2019 |      307 |    60 | 176\thinsp{}535 | 10.29 |    65.14% |
+| B   | 2016--2017 |      372 |   138 | 371\thinsp{}891 |  9.10 |    56.72% |
+| B   | 2017--2018 |      393 |   187 | 407\thinsp{}696 |  7.31 |    60.81% |
+| B   | 2018--2019 |      437 |   201 | 421\thinsp{}461 |  6.26 |    62.47% |
 
 Course A is subdivided into two successive instructional units that each cover five programming topics -- one topic per week -- followed by an evaluation about all topics covered in the unit.
 Students must solve six programming exercises on each topic before a deadline one week later.