[soln-filter]

Parameterises an exponential solution filter with

1. nsteps — apply filter every nsteps:

   int

2. alpha — strength of filter:

   float

3. order — order of filter:

   int

4. cutoff — cutoff frequency below which no filtering is applied:

   int

Example:

[soln-filter]
nsteps = 10
alpha = 36.0
order = 16
cutoff = 1