using grid.arrange
https://cran.r-project.org/web/packages/gridExtra/vignettes/arrangeGrob.html

set and mirror axis limits:
```
scale_y_continuous(
          breaks=seq(glob$PriceMin, glob$PriceMax, round(glob$StdDev * .5,2)),
          limits = c(glob$PriceMin, glob$PriceMax)
      ) +
```