title: Arguments for basemap drawmeridions?
body: <p>Is there a way to specify the thickness and color of meridians and parallels in matplotlib-basemap? specifically drawmeridians() and drawparallels()</p>
  
  <p>The documentation is hard to find.</p>
  
  <pre><code>m = Basemap(projection='ortho',lat_0=90,lon_0=0)
  x, y = m(lon,lat)
  m.drawmapboundary(zorder=0)
  m.drawparallels(np.arange(0.,90.,15.))
  m.drawmeridians(np.arange(0.,360.,60.), labels=[True,True,True,True])
  m.scatter(x,y,3,marker='o',color=str(colors[i]), zorder=1)
  </code></pre>
  
  <p>Right now the output is a thick solid black line, however I am looking for a thinner dark gray segmented line.</p>