added header_separate function based on the suggestion in #541
diff --git a/docs/plots_in_tables.Rmd b/docs/plots_in_tables.Rmd
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index 0000000..95766c8
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+---
+title: "In-table Plots"
+output:
+ html_document:
+ theme: cosmo
+---
+
+```{r, include=F}
+knitr::opts_chunk$set(warning = F, message = F)
+```
+
+Sometimes it's a delight to see plots in a table. Here we provide some examples and recipes on some common tasks. We will use the following packages.
+
+
+```{r}
+library(kableExtra)
+library(plotly)
+library(sparkline)
+library(tidyverse)
+```
+
+