Data with irregular intervals

-10.0 -5.71 -1.43 2.86 7.14 11.4 15.7 20.0 -31.8 -20.1 -8.49 3.17 14.8 26.5 38.1 49.8 -10.0 -5.71 -1.43 2.86 7.14 11.4 15.7 20.0 -31.8 -20.1 -8.49 3.17 14.8 26.5 38.1 49.8

SQL source code for this example:

DRAW LINECHART WITH
   AXIS BOTTOM
   AXIS LEFT
   AXIS TOP
   AXIS RIGHT;

SELECT series AS series, x AS x, y AS y, 'circle' as pointstyle
   FROM example_data;