1 1       zerox zeroy         graph coordinate center
-x 0 25    zx min max          (character, real, real) if zx='x' then set xaxis
y 1e6 1e9     zy min max          (character, real, real) if zy='y' then set yaxis
10 3 2 9  xinterval yinterval xsubintervals ysubintervals: axis intervals
4 10      xwidth    ywidth    width of numbers in characters
0 0       xdecimal  ydecimal  number of decimal places
16.5 22.0 xsize     ysize     size of axes in cm
Year
Bases
a         zc                  'c' crosshairs, axXyYnN
n 2       zxl base            if zxl='l' then make x axis log to the given base
l 10      zyl base            if zyl='l' then make y axis log to the given base
          *********************************************************************
4 5       xcolumn   ycolumn   columns of xyin that determine plot location
1         symbol column       the xyin column to read symbols from
0  0      xscolumn  yscolumn  columns of xyin that determine the symbol size
0 0 0     hue saturation brightness   columns for color manipulation
          *********************************************************************
c         symbol-to-plot      c(circle)bd(dotted box)x+Ifgpr(rectangle)
l         symbol-flag         character in xyin that indicates that this symbol
0.05      symbol sizex        side in inches on the x axis of the symbol.
0.05      symbol sizey        as for the x axis, get size from yscolumn
c- 0.05   no connection (example for connection is c- 0.05 for dashed 0.05 inch)
l  0.05   linetype  size      linetype l.-in and size of dashes or dots
          *********************************************************************
d         symbol-to-plot      c(circle)bd(dotted box)x+Ifgpr(rectangle)
e         symbol-flag         character in xyin that indicates that this symbol
0.05      symbol sizex        side in inches on the x axis of the symbol.
0.05      symbol sizey        as for the x axis, get size from yscolumn
c- 0.05   no connection (example for connection is c- 0.05 for dashed 0.05 inch)
n  0.05   linetype  size      linetype l.-in and size of dashes or dots
          *********************************************************************
+         symbol-to-plot      c(circle)bd(dotted box)x+Ifgpr(rectangle)
t         symbol-flag         character in xyin that indicates that this symbol
0.50      symbol sizex        side in inches on the x axis of the symbol.
0.05      symbol sizey        as for the x axis, get size from yscolumn
n- 0.05   no connection (example for connection is c- 0.05 for dashed 0.05 inch)
n  0.05   linetype  size      linetype l.-in and size of dashes or dots
          *********************************************************************
.
          *********************************************************************