Among the 64 grid pairs of HXT, 48 are called Fourier elements whose slit and
wire widths are the same to each other while 16 are fanbeam elements
whose wire widths are three times larger than their slit widths. See Kosugi et al. (1991)
for more information on the arrangement of the 64 SC's.
Modulation pattern parameters of each SC's, which are necessary for
synthesizing images, are listed in a file whose name is obtained by the
following command:
IDL> file = concat_dir('$DIR_HXT_CAL', 'para3.dat')
In the image synthesis procedure modulation patterns of Fourier SC's are
approximated by sinusoidal patterns while those of fanbeam SC's by triangular
ones.