The beginning and the end, respectively, of a respective period having a period duration T are thereby placed arbitrarily into {HEAD ~ the respective minimum} of the angle of {TAIL ~ inclination ψ} 
The beginning and the end , respectively , of a respective period having a period duration T are thereby placed arbitrarily into { HEAD ~ the respective minimum } of the angle of { TAIL ~ inclination ψ }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL