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+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)
+      ) +
+```
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