Are the amplitudes of the component harmonic waves of periods 24, 12, 8 and 6 hours; al, a2, a 3, a 4, are the corresponding phase angles.
For the next week, Alex continued to wake up more frequently and stay awake for longer periods of time, but he still didn't talk – didn't even try.
The two travelers killed the time picking over a bland lunch and alternating long walks with longer periods of sitting on hard seats, re-reading a discarded newspaper.
It was in the way he stood, gazing absently out the window for long periods of time.
Different periods of his career both in his speeches in the Irish House of Lords and in his correspondence with ministers in London.
