Summary

A cupid's bow depth of 1.69mm sits below the 2.30 to 4.00mm ideal range and scores 8.0 for Niall Horan, which gives his upper lip a shallower bow than most. The measurement evaluates the definition of the upper lip's cupid's bow shape, where a well-defined bow with a noticeable dip creates a more attractive lip appearance. His value is higher than 25% of the men on the wiki, and he is matched exactly by Adolf Hitler, Mustafa Ataturk and Ruben Slikk at the same 1.69mm. At the far end, Crip Mac records 4.25mm, the highest value on the wiki, while Froy Guiterrez is lowest at -0.27mm. Compare this with Niall's Interpupillary-Mouth Width Ratio in the full Harmony breakdown.