The solder fillets around the base of the header pins are almost flat - very different from the kind of fillets you'd expect to around a 0.1" header. These kind of fillets are very common on ST's evaluation boards. By the consistency of the soldering, it look like it has been done on a machine. I am interested in knowing the soldering technique involved in this. 

[![enter image description here](https://i.stack.imgur.com/c94t5.jpg)](https://i.stack.imgur.com/c94t5.jpg)

Kind of fillet you'd generally expect to see:
[![enter image description here](https://i.stack.imgur.com/uw7xU.png)](https://i.stack.imgur.com/uw7xU.png)