deletions | additions       diff --git a/figures/s1s-speed.pdf b/figures/s1s-speed.pdf  new file mode 100644  index 0000000..6712991  Binary files /dev/null and b/figures/s1s-speed.pdf differ diff --git a/figures/s2-flow.pdf b/figures/s2-flow.pdf  new file mode 100644  index 0000000..20d965d  Binary files /dev/null and b/figures/s2-flow.pdf differ