In your case you can comment out all the lines for saving the file. This file can directly assign the time signal to the source specified.
In addition, only in certain non-linear simulations you need sine wave. In linear cases you can still use the pulse but only set the monitor to record the center frequency with one point. This will be faster and accurate. However if you use sine wave you can get the time domain result accurately but not in the frequency domain, since the frequency domain result is obtained from Fourier transform, which requires the signal to decay to zero. Using a filter will modify the amplitude so the result amplitude is not accurate.
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