Points of enlightenment:
-Those tees never come curved.
-The brass bits are silver brazed
-the copper is annealed.
To install:
-place tee over basin holes and line up centre of tee with centre hole
-hold copper firmly with a hand on either end and slowly begin to bend it with your thumb acting as a back support and to gauge whether the copper is starting to kink.
-once bent, trim the excess pipe on either end.
If it happens to kink a little, don't worry. Basins only have to put out 4 litres per minute. You can achieve that through a 3mm hole @400kpa