#include <headerfile.h> // This is included here so that the compiler can warn
                        // if the 'extern' declarations don't match the actual definitions!

code unsigned int x_data[10]={0,1,2,3,4,5,6,7,8,9};
code unsigned int y_data[10]={10,11,12,13,14,15,16,17,18,19};
<i>etc</i>