Sampling profile

The sampling profile is an essential part of the sig computation. All parameters to describe the influence of the time series sampling in Fourier space is entirely contained in the three parameters $\alpha _0$, $\beta _0$, and $\theta _0$. The values of $\alpha _0$ and $\beta _0$ are measures for the maximum and minimum sig for all phase angles at a given frequency, and the angle $\theta _0$ determines the phase angle where maximum sig is obtained at the frequency under consideration. A detailed description is given by Reegen (2007). If the keyword profile is provided in the .ini file, the sampling profile for the given time series is written to the file profile.dat. The four columns refer to

1. frequency [inverse time units],
2. $\alpha _0$,
3. $\beta _0$,
4. $\theta _0$ [rad].

Example. In the file output.ini, the keyword profile is given and forces SIGSPEC to generate an output file output/profile.dat representing the sampling profile displayed in Fig.12.

Figure 12: Sampling profile for the sample project output. The lower curve refers to $\alpha _0$, the upper curve to $\beta _0$. The orientation angle of the rms error ellipse, $\theta _0$ is not plotted.