The output time series bolometer samples are created by interpolating the supplied input sky image at the position of the reference time series sample centre. Various interpolation methods can be used (see parameter INTERP). Gaussian noise may also be added (see parameter SIGMA).
The output time series cubes inherit all meta-data from the corresponding input reference time series. The only thing modified is the values in the NDF "Data" array.
PARAMS( 1 ) is required by all the above schemes. It is used to specify how many pixels are to contribute to the interpolated result on either side of the interpolation point in each dimension. Typically, a value of 2 is appropriate and the minimum allowed value is 1 (i.e. one pixel on each side). A value of zero or fewer indicates that a suitable number of pixels should be calculated automatically. 
PARAMS( 2 ) is required only by the SombCos, SincSinc, SincCos, and SincGauss schemes. For the SombCos, SincSinc, and SincCos schemes, it specifies the number of pixels at which the envelope of the function goes to zero. The minimum value is 1.0, and the run-time default value is 2.0. For the SincGauss scheme, it specifies the full-width at half-maximum (FWHM) of the Gaussian envelope. The minimum value is 0.1, and the run-time default is 1.0. Good results are often obtained by approximately matching the FWHM of the envelope function, given by PARAMS(2), to the point-spread function of the input data. 
SMURF -- the Sub-Millimetre User Reduction Facility