Example 27 (points plot with discrete marker palette)

female circle; male square Tom,35.1,6.3,male,20 Harriet,1.5,2.1,female,10 Antonia,35.2,5.1,female,25 Ada,4.5,3.1,female,12 Foo,10.1,3.9,female,15 Bar,80.4,9.1,female,22 Baz,5.2,3.2,male,13 Jim,60.1,8.1,male,24 Ted,70.1,9.1,male,18 Jerry,40.6,7,male,16