Known for hot temperatures, Southern California and the rest of the Southwest United States are undergoing a cold snap that has set records in many areas throughout the region.
Periodogram is the spectrum of a set of time signal usually obtained by fast Fourier transform (FFT). It usually shows frequency as x-axis, and magnit... This page may be out of date.
seismogram - the graphical record of an earth tremor made by using a seismograph graph, graphical record - a visual representation of the relations between certain quantities plotted with reference to a set of axes