What that means is that when pressure and number of moles are kept constant, increasing the temperature will result in an increase in volume. Likewise, a decrease in temperature will result in a decrease in volume. In your case, the volume of the gas decreased by a factor of about 3, from "140.0 mL" to "50.0 mL".
Line 1: straight horizontal line Line 2: straight line at a slope Line 3: exponential growth curve Line 4: the topmost curve (the one that initially increases but then starts levels out)
