title: Show x-axis and y-axis for every plot in facet_grid
body: <p>As similar question has been asked before (<a href="https://stackoverflow.com/questions/17661052/force-x-axis-text-on-for-all-facets-of-a-facet-grid-plot">here</a>) but I can't adjust the solution provided there to my specific problem. For every plot shown below, there should be a x as well as y-axis. </p>
  
  <p>The data:</p>
  
  <pre><code>dput(df_nSubj)
  structure(list(nSubj = c(10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 
  10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 10L, 
  10L, 10L, 10L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 
  20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 20L, 
  20L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 
  30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 30L, 40L, 
  40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 
  40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 40L, 50L, 50L, 50L, 
  50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L, 
  50L, 50L, 50L, 50L, 50L, 50L, 50L, 50L), family = structure(c(1L, 
  1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 
  3L, 4L, 4L, 4L, 4L, 4L, 4L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 
  2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 1L, 
  1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 
  3L, 4L, 4L, 4L, 4L, 4L, 4L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 
  2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 1L, 
  1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 
  3L, 4L, 4L, 4L, 4L, 4L, 4L), .Label = c("AOV", "MLM1", "MLM2", 
  "MLM3"), class = "factor"), Spher = structure(c(1L, 1L, 1L, 2L, 
  2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 
  1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 
  1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 
  2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 
  1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 
  1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 
  2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 1L, 2L, 2L, 2L, 1L, 1L, 
  1L, 2L, 2L, 2L), .Label = c("met", "vio"), class = "factor"), 
      effSize = c(0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 0.2, 0.5, 0.8, 
      0.2, 0.5, 0.8), pow = c(0.12, 0.53, 0.84, 0.1, 0.4, 0.74, 
      0.13, 0.55, 0.84, 0.11, 0.44, 0.74, 0.12, 0.5, 0.82, 0.1, 
      0.43, 0.76, 0.12, 0.49, 0.81, 0.1, 0.43, 0.76, 0.2, 0.84, 
      0.99, 0.15, 0.72, 0.97, 0.21, 0.81, 0.98, 0.17, 0.69, 0.95, 
      0.2, 0.83, 0.99, 0.17, 0.75, 0.97, 0.19, 0.82, 0.99, 0.17, 
      0.75, 0.97, 0.32, 0.95, 1, 0.23, 0.87, 1, 0.32, 0.92, 1, 
      0.25, 0.83, 0.99, 0.3, 0.94, 1, 0.24, 0.89, 1, 0.3, 0.94, 
      1, 0.24, 0.89, 1, 0.41, 0.99, 1, 0.29, 0.96, 1, 0.4, 0.97, 
      1, 0.3, 0.92, 1, 0.38, 0.99, 1, 0.32, 0.97, 1, 0.37, 0.98, 
      1, 0.32, 0.97, 1, 0.5, 1, 1, 0.36, 0.98, 1, 0.47, 0.99, 1, 
      0.36, 0.96, 1, 0.47, 1, 1, 0.4, 0.99, 1, 0.46, 1, 1, 0.4, 
      0.99, 1)), class = "data.frame", .Names = c("nSubj", "family", 
  "Spher", "effSize", "pow"), row.names = c(NA, -120L))
  </code></pre>
  
  <p>plot:</p>
  
  <pre><code>require(ggplot2)
  require(grid)
      pl1 &lt;- ggplot(data=df_nSubj,aes(x=nSubj,y=pow,group=family))+
        geom_point(aes(shape=family))+geom_line()+
        labs(x="Number of subjects",y="Power",shape="")+
        scale_y_continuous(limits=c(0.2,1),breaks=c(0.2,0.4,0.6,0.8,1))+
        guides(shape = guide_legend(ncol = 4))+
        facet_grid(Spher~effSize)+
        theme_bw()+
        theme(legend.position = "top",
              panel.margin = unit(2, "lines"),
              legend.key = element_blank(),
              strip.text.x = element_blank(),
              strip.text.y = element_blank(),
              strip.background = element_blank(),
              panel.border=element_blank(),
              axis.line=element_line(),
              axis.title.x = element_text(vjust=-0.5))
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/Jf39n.png" alt="here&#39;s how it looks like"></p>
  
  <p>Thanks in advance</p>