Fourier transform of the longest continuous stretch of data

Select the longest continuous set of data (ignore zeros that last only one minute or so), do its Fourier transform, and plot the resulting Fourier spectrum in the interval $2140 - 2340$ $\mu$Hz. Be sure to adjust your conversion from frequency index $m$ to frequency $\nu$ for the new parameters. Compare it with what you got for the same range when you did the full dataset. In your report compare and discuss issues of resolution and artifacts caused by gaps in the data.