I’ve noticed that distinction too. Che mian (hand-torn, as opposed to hand-pulled, noodles) can be as wide as (or wider than) the well-known Xi’an famous foods biang biang noodles or as narrow as used in the you po che mian served at Terra Cotta Warrior, Xi’an Famous Foods and my favorite Xi’an joint in Shanghai.
Incidentally, a closeup photo I took of my very first biang biang noodles at XFF’s Golden Mall location in 2008 has been used on more than 270 websites (including some in China) to illustrate biang biang noodles, thanks to Wikimedia Commons.
