Low body fat. That line isn't 'tone'. It comes from having low body fat. Best way to get that line is to clean up your diet as much as possible. How? You tell us. What are your stats? Height, weight, and activity level. From that you should be able to figure out what an appropriate diet is to drop body fat.
It is also possible that you just don't have enough abdominal muscle to have that line. In that case, weighted ab exercises would help add muscle. Also, if you just don't have enough muscle for that line to show, you may actually need to start by eating more food than you are now.
Either way, giving your stats will help answer this question.
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