| agg | Aggregation using box-averaging | 
| downscale | Downscale a precipitation field | 
| fft2d | Compute spatial Fourier power spectrum | 
| fitslope | Compute logarithmic slope of a spatial power spectrum | 
| gaussianize | Gaussianize field using rank ordering | 
| initmetagauss | Generate the spectral amplitudes for a metagaussian field | 
| interpola | Interpolate field using nearest neighbors | 
| lon_lat_fine | Linear interpolation of longitude and latitude vectors to higher resolution | 
| mergespec | Spectral merging of a coarse field and of a fine field at a given wavenumber | 
| metagauss | Generate a metagaussian field | 
| rainfarm | Perform RainFARM downscaling | 
| remapcon | Conservative remapping | 
| rfweights | Derive weights from a fine-scale precipitation climatology | 
| smoothconv | Smoothening using convolution with a circular kernel |