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The `CORFUN` option takes the active time series and calculates the
desired correlation function from it.

`FFT`- This option is to calculate the correlation function using the Fast
Fourier Transform method.
`DIRECT`- This option is to calculate the correlation function using the direct
multiplication method.
`P0`- This option gives the direct correlation function.
`P1`- This is to obtain the correlation function of first order Legendre
Polynomial.
`P2`- This is to obtain the correlation function of second order Legendre
Polynomial.
`LTC`- Long tail correction (subtracting the value of last element of the
correlation function.)
`NLTC`- No long tail correction.
`NONORM`- Correlations are not normalized. This is useful for adding correlations computed in different trajectories.

The defaults are `FFT`, `P0`, `LTC`.