**fScan Reference Manual, Chapter 2 (CmdLineOptions): lowfreq**
===== Lowfreq -- Remove slow temporal fluctuations (detrend)=====
**usage:** -lowfreq nnodes flag
===== =====
For DETRENDING, a smooth curve is generated for each pixel timecourse as a cubic spline interpolation through NNODES points. The nodes are uniformly spaced along the timecourse; their values are calculated piecewise based on the FLAG argument.
  *FLAG - 
    * 0 - mean
    * 1 - median
    * 2 - midpoint of least squares fit 

**See Also:**\\
[[jvs:fscan|fScan Home]], 
[[jvs:fscan:manual|fScan Manual]], 
[[jvs:fscan:manual:chapter2|CmdLineOptions]], 
[[jvs:fscan:manual:help|Manual Help]]