IBM Release 1.93 manual List, Modematch

LIST	Stores a list of field values as ASCII floating point numbers, suitable
	for reading into a spreadsheet or a plotting program such as
	GNUPLOT. The row-column arrangement of a 3-dimensional list
	file depends on the value of orientation. Coordinate axes are always
	taken in cyclic order, with the leftmost position in the first line
	corresponding to the minimum of all coordinates; in a 2-D list in XY
	orientation (perpendicular to Z), columns correspond to the x
	coordinate and rows to the y coordinate. In YZ orientation, y goes
	across columns and z goes down rows, and in ZX orientation, z
	goes across columns and x down rows. (ZY is the same as YZ, and
	XZ is the same as ZX--cyclic order is always preserved.) In a three-
	dimensional list, the perpendicular variable is most slowly varying.
	For example, in XY orientation, a 3-D list file with M planes (Z) N
	rows (Y) and P columns (X) would have list N rows for the first
	plane, another N for the second plane, and so on. The file format is
	as follows, with integer indices i, j, and k corresponding to
	coordinates x, y, and z.
	Parameters: variable file orientation xlo xhi ylo yhi zlo zhi phase indexn
	kmin kmax jmin jmax imin imax
	lambda indexN dz dy dx
	coordinates arrangement
	(real, imag) (real, imag) (real, imag)....
	(real, imag) (real, imag) (real, imag)....
	...
	(real, imag) (real, imag) (real, imag)....
	The value of coordinates can be polar or rectangular, and arrangement
	can be normal or FFT.
MODEFILE	A variation on the LIST command, for producing 2-D list files of Ex,
	Ey, and Ez The appropriate file name additions are supplied
	automatically.
	Parameters: file orientation xlo xhi ylo yhi zlo zhi phase indexn
MODEMATCH	Computes the far-field pattern of the simulated fields, taken from
	the given plane, and compares it with the analytically computed
	pupil function requested. It returns the normalized overlap integral
	of the two across the (u, v) plane. This is a complicated way of
	saying that MODEMATCH returns the coupling efficiency from the
	simulated plane to a receiver whose sensitivity pattern matches the
	given pupil function, e.g. a fibre. Known pupil functions at present
	are GAUSSIAN, AIRY, FLATTOP, and BESSJ0. The refractive index
	is taken to be the real part of the index at the centre of the given
	plane, as in the FARFIELD order.

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