Is it gridline customised?

[PGandhi30]

Expected Behavior

Actually, Gridline is perfect display but need a dashed line as a separator of a row.
row like example:
A B C D
.- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -.
E F G H

Actual Behavior

A B C D
.___________________________.
E F G H

Data is perfect display main difference of a line. Can you please help me on that?

Note: period sign is ignore in line drawing.