Preparation for knitr hook
Revert "Preparation for knitr hook"

This reverts commit 7874cdaf419832a133dab37014fdbfb2b6e2aac6.
Revert "Revert "Preparation for knitr hook""

This reverts commit adc51864343ede340bc8056a1145076a07d03045.
New plot - time series plot