Calculate the values of y for x = 0.1, 0.2, 0.3, and 0.4 using the formula y = 2x − 0.6.

Substitute $x = 0.1$ into the rule $y = 2x - 0.6$:

$$y = 2(0.1) - 0.6$$ $$y = 0.2 - 0.6$$ $$y = \boxed*{-0.4*}$$

Substitute $x = 0.2$ into the rule $y = 2x - 0.6$:

$$y = 2(0.2) - 0.6$$ $$y = 0.4 - 0.6$$ $$y = \boxed*{-0.2*}$$

Substitute $x = 0.3$ into the rule $y = 2x - 0.6$:

$$y = 2(0.3) - 0.6$$ $$y = 0.6 - 0.6$$ $$y = \boxed{0}$$

Substitute $x = 0.4$ into the rule $y = 2x - 0.6$:

$$y = 2(0.4) - 0.6$$ $$y = 0.8 - 0.6$$ $$y = \boxed{0.2}$$

The completed output values for the flow diagram are:
Input $(x)$ $\rightarrow$ Output $(y)$
$0.1 \rightarrow \boxed*{-0.4*}$
$0.2 \rightarrow \boxed*{-0.2*}$
$0.3 \rightarrow \boxed{0}$
$0.4 \rightarrow \boxed{0.2}$