An experiment with an $RC$ circuit is used for determining the capacitance of an unknow capacitor. In the circuit, shown in the figure, a $5-M$ resistor is connected in series to the unknown capacitor $C$ and a battery. The experiment starts by closing the switch and measuring the voltages, vR$,$ across the resistor every $2$ seconds for $30$ seconds. The data measured in the experiments are saved in data.txt file.

Load the experimental data, show the time vs$.$ voltage plot, by having horizontal axis labeled Time $($s$),$ and vertical axis labeled vr $($V$),$ with dash red line in circle makers in MATLAB.