## ----setup, echo = FALSE, include=FALSE----------------------------------
knitr::opts_chunk$set(cache=TRUE, echo=TRUE, warning = FALSE, message=FALSE, collapse = FALSE, prompt=FALSE,comment=NA, fig.align="center", fig.width=5, fig.height=4, dpi = 96, fig.show = "hold", fig.keep="last", sanitize=TRUE)

options(java.parameters="-Xmx2g")# optional, but more memory for Java helps
options(dplyr.print_min=25)

