Axes for graphs and colorbars
xaxis — Draw x-axis
yaxis — Draw y-axis
xcaxis — Plot x-axis with labels between ticks
ycaxis — Plot y-axis with labels between ticks
zaxis — Draw a z-axis.
arange — Return evenly spaced values within interval
caxis — Plot colorbar axis
minorticks — Add more ticks to an existing axis
overline — Draw a line above data with a text above it