#  AIPS HELP file for UVBXFN in 31DEC22

### HELP SECTION

```UVBXFN
Use: The type of function used  when counting for uniform
weighting.  If UVBOX = 0, this is irrelevant since all
functions are 1 at the center cell.  If UVBXFN < 0, the
function is taken as a function in U and V [i.e. the
counting weight = f(du)*f(dv)]; if UVBXFN > 0, the function
is taken as a function in radius [i.e. the counting weight
= f(sqrt(du*du+dv*dv))] giving everything approxiamtely
circular support.

If ABS(UVBXFN) = K, then

K = 1 : Pill box      f(x) = 1             (x <= UVBOX)

K = 2 : linear        f(x) = 1 - x / (UVBOX+1)

K = 3 : exponential   f(x) = exp(-2x/(UVBOX+1))

K = 4 : Gaussian      f(x) = exp(-(2x/(UVBOX+1))**2)

Other details: f(x) >= 0 and f(x) = 0 when x > UVBOX.
du and dv take only integer values: 0, 1, 2, ... UVBOX.
Null value:   0 => 1, < -4 => -1, > 4 => 1
IMAGR.....Fourier transform and Clean UV data with a full range of
calibration (application), weighting, Cleaning, and
wide-field correction options.
SCIMG.....Full-featured imaging plus self-calibration loop with
editing.
SCMAP.....Imaging plus self-calibration loop with editing.
Procedures:
LINIMAGE..Build image cube from multi-IF data set.
```

AIPS