title: Lower trailing parts of letters "g" and "y" etc hidden/cut off/overwritten in ggplot labels
body: <p>The bottom parts of the "y"'s and "g"'s are cut off in this map.  See "dryland" and "irrigated" under soy.  </p>
  
  <p><a href="https://i.stack.imgur.com/D3wTe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/D3wTe.png" alt="enter image description here"></a></p>
  
  <p>What setting controls this?  Here is my <code>theme_map</code> function</p>
  
  <pre><code>theme_map &lt;- function (base_size = 12, base_family = "") {
    theme_gray(base_size = base_size, base_family = base_family) %+replace% 
      theme(
        axis.line=element_blank(),
        axis.text.x=element_blank(),
        axis.text.y=element_blank(),
        axis.ticks=element_blank(),
        axis.ticks.length=unit(0.3, "lines"),
        axis.ticks.margin=unit(0.5, "lines"),
        axis.title.x=element_blank(),
        axis.title.y=element_blank(),
        legend.background=element_rect(fill="white", colour=NA),
        legend.key=element_rect(colour="white"),
        legend.key.size=unit(1.2, "lines"),
        legend.position="right",
        legend.text=element_text(size=rel(0.8)),
        legend.title=element_text(size=rel(0.8), face="bold", hjust=0),
        panel.background=element_blank(),
        panel.border=element_blank(),
        panel.grid.major=element_blank(),
        panel.grid.minor=element_blank(),
        panel.spacing=unit(0, "lines"),
        plot.background=element_blank(),
        plot.margin=unit(c(1, 1, 0.5, 0.5), "lines"),
        plot.title=element_text(size=rel(1.2)),
        strip.background=element_rect(fill="white", colour="white"),
        strip.text.x=element_text(size=rel(.8)),
        strip.text.y=element_text(size=rel(0.8), angle=-90) 
      )   
  }
  </code></pre>
  
  <p>I am just dipping my toe into <code>ggplot2</code> after spending a long time as a curmudgeonly devotee of base graphics.  I found that <code>theme_map</code> function on the internet somewhere, so I don't understand it yet.  Can someone please tell me which of those settings I'd need to tweak to solve my problem?</p>
  
  <p>Here's my code for generating (one of) those maps, but I'm assuming that the relevant part is in the <code>theme_map</code> function</p>
  
  <pre><code>mapcorn &lt;- ggplot(USA_fort_premade) + 
      aes(long,lat,group=group) + 
      geom_polygon(aes(x=long,y=lat, group=group, fill=yield.mean), 
                   data=REAP_fort_corn)+
      geom_path(color="grey", lwd = .1) +
      coord_fixed(1.3) +
      facet_wrap( ~ irr) +
      scale_fill_gradient2(low = rgb(.9, .4, 0), mid = rgb(.9, .9, 0),
                           high = rgb(0,.8,0), midpoint = mean(REAP_fort_corn$yield.mean, na.rm = TRUE), 
                           space = "Lab", name = "bu/ac",
                           na.value = "grey50", guide = "colourbar") +
      theme_map() +ggtitle("Corn")
  </code></pre>
  
  <p>Apologies for not reproducible, but the data is huge and this should be a fairly simple question.  A hard one to google however if you don't know the terms.    </p>