The first two numbers are the desired number of tick intervals on the x and y axes respectively. Positions of axis components. The first component is the distance from the axis label to the axis position, in text lines. Positive numbers measure outside the plot region, negative numbers inside. A value of 1 gives grid lines.
Negative values give tick marks outside the plotting region.
Extended axes may be widened slightly if any points are very near the edge. This style of axis can sometimes leave large blank gaps near the edges. Useful for generating series of fixed-scale plots.