aal_125_masked.png missing?

[jarrodmillman]

When I try
$ pdflatex structconnrepro.tex
I get
! Package pdftex.def Error: File `figures/aal_125_masked.png' not found.

It looks like the following are missing as well:
aal_125_masked.png
aal_135_masked.png
aal_145_masked.png
aal_155_masked.png
aal_165_masked.png
aal_175_masked.png
aal_185_masked.png
dkt_125_masked.png
dkt_135_masked.png
dkt_145_masked.png
dkt_155_masked.png
dkt_165_masked.png
dkt_175_masked.png
dkt_185_masked.png