Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: Below is the graph of $y = a \tan bx$ for some positive constants $a$ and $b.$  Find $ab.$

[asy]import TrigMacros;

size(250);

real g(real x)
{
	return 2*tan(3/2*x);
}

draw(graph(g,-pi + 0.01,-pi/3 - 0.01),red);
draw(graph(g,-pi/3 + 0.01,pi/3 - 0.01),red);
draw(graph(g,pi/3 + 0.01,pi - 0.01),red);
limits((-pi,-4),(pi,4),Crop);
draw((-pi/3,-4)--(-pi/3,4),dashed);
draw((pi/3,-4)--(pi/3,4),dashed);
trig_axes(-pi,pi,-4,4,pi/6,1);
layer();
rm_trig_labels(-5, 5, 6);

label("$1$", (0,1), E);
label("$2$", (0,2), E);
label("$3$", (0,3), E);
label("$-1$", (0,-1), E);
label("$-2$", (0,-2), E);
label("$-3$", (0,-3), E);
[/asy]
user