x1   y    Make
10  9.8    A 
20  12.5   A
20  14.2   A
30  14.9   A
40  19.0   A
40  16.5   A
50  20.9   A
60  22.4   A
60  24.1   A
70  25.8   A
10  15.0   B
20  14.5   B
20  16.1   B
30  16.5   B
40  16.4   B
40  19.1   B
50  20.9   B
60  22.3   B
60  19.8   B
70  21.4   B