fig.num is a number by default, so should not use is.null()
fig.num is a number by default, so should not use is.null()

fboehm/cboettig_site,antass/labnotebook3,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,fboehm/cboettig_site,antass/labnotebook3,fboehm/cboettig_site