Measurement of the angle of the predorsal profile (θ), defined as the angle the tangent to the predorsal profile originating from the base of the dorsal-fin spine makes with the horizontal.

 
 
  Part of: Ng HH, Kottelat M (2023) Mystus celator, a new species of catfish from northern Myanmar (Actinopterygii: Siluriformes: Bagridae). Vertebrate Zoology 73: 981-990. https://doi.org/10.3897/vz.73.e110875