two lines on the same graph

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clear all; close all;
a = arduino('COM3', 'uno') % or use COM port
tic %start timer
max_samples = 10; % how many times do we check the sound sensor?
tic %start timer
for i = 1:max_samples
 moisture_data(i) = readVoltage(a,'A0');
 time_data(i) = toc;
 end
plot(time_data, moisture_data)

readVoltage(a,'A0') is a moisture sensor this loop takes 10 samples from the sensor then graphs it i want to pause for 30 seconds put the sensor in water and run this loop again making a second line on the same set of axes as the first how do i do that