=
{
"available filters (see seife.f by Erhard Wielandt):\n"
"lpb t0 o Butterworth low-pass of order o\n"
"hpb t0 o Butterworth high-pass of order o\n"
"lp2 t0 h 2nd order low-pass\n"
"hp2 t0 h 2nd order high-pass\n"
"bp2 t0 h 2nd order band-pass\n"
"lp1 t0 1st order low-pass\n"
"hp1 t0 1st order high-pass\n"
"le2 t0s hs t0 h\n"
" 2nd order low-pass equalizer\n"
"he2 t0s hs t0 h\n"
" 2nd order high-pass equalizer\n"
"le1 t0s t0 1st order low-pass equalizer\n"
"he1 t0s t0 1st order high-pass equalizer\n"
"int t0 integrate with time constant t0\n"
" (t0=0.: sets t0=1.)\n"
"dif t0 differentiate with time constant t0\n"
" (t0=0.: sets t0=1.)\n"
"tid n remove tides (tides are interpolated over n samples) \n"
" (n=0: interpolation over 5 minutes)\n"
"first remove value of first sample\n"
}