Hi, everybody! I can not really understand the particular behavior of the sin2thw with respect to the scale (like on the plot below). Clearly there are three regimes from the left to the right: a plato, a degradation and a steep rise. But why exactly does the curve behave like this? The W-boson mass scale is clearly one pole here, where weak interaction starts playing role, but this is not enough for understanding this. The runnings of the EM and weak couplings must be causing this, but somehow they do not add up to the sin2thw curve in my head. Would be grateful for any explanation or a link to a good source describing this!