title: Greek letter in hist3D
body: <p>I'd like to plot a 3D histrogram with Greek letter using <code>hist3D</code>. I used the package <code>latex2exp</code> and <code>plot3D</code> My MWE is</p>
  
  <pre><code>test &lt;- matrix(runif(100), ncol = 10)
  plot3D::hist3D(z = test, bty = "g", phi = 15,  theta = -15,
                 xlab = TeX("Polygonal vertices $(\\xi_1)$"), ylab = TeX("Polygonal vertices $(\\xi_2)$"), 
                 zlab = "Frequency", main = "",
                 col = "white", border = "black", shade = NULL, curtain = T, plot = T,
                 ticktype = "detailed", space = 0.15, d = 2, cex.axis = 1e-9, image = T, contour = T)
  </code></pre>