Seggewiss (1967) studied three different fields in the area of Trumpler 24,
named Tr24I, Tr24II and Tr24III.

The three fields are available as scanned maps, but only Tr24III has
been chosen for the plot of rectangular coordinates.

Numbers for Tr24I goes from 1 to 148, for Tr24II from 301 to 366 and 
for Tr24III from 501 to 593