set style data l;

set xlabel "date";
set ylabel "frequency (per million)";
set xrange [*:*]
set yrange [0:*];
unset grid;
;
set title "\"\@salst\" [slice=5 norm=date+class win=1]";
;
;
plot "-" title "Schulbuch";
1645	0
1650	0
1655	0
1660	0
1665	0
1670	0
1675	0
1680	0
1685	0
1690	0
1695	0
1700	0
1705	0
1710	0
1715	0
1720	0
1725	0
1730	0
1735	0
1740	0
1745	0
1750	0
1755	0
1760	0
1765	0
1770	0
1775	0
1780	0
1785	0
1790	0
1795	0
1800	0
1805	0
1810	0
1815	0
1820	0
1825	0
1830	0
1835	0
1840	0
1845	0
1850	0
1855	0.0282217052005829
1860	0.0282217052005829
1865	0.0282217052005829
1870	0.0114513682890702
1875	0.0329356138380985
1880	0.0457883668007448
1885	0.0343369985116746
1890	0.0128527529626463
1895	0
1900	0.0101187696148871
1905	0.0158262972739728
1910	0.0398033418433184
1915	0.0296845722284314
1920	0.0359655668540185
e