X,    Y  TYPE
   0,    0,  c
 450,    0,  g
1050,    0,  a
1350,    0,  i
...

##</code><code>##

0.15 * ( 1 + int( 8.65 / 0.15 ) ) x 0.15 * ( 1 + int( 4.1 / 0.15 ) )
8.7 x 4.2