To get the observation time
IDL> print,fmt_tim(index) <CR>
To get the image frequency
IDL> print,norh_gt_freq(index) <CR>
To get the circular polarization information
IDL> print,norh_gt_polariz(index) <CR>
To get the Sun center
IDL> print,norh_cen(index) <CR>
To get the roll of the image
IDL> print,norh_cen(index,roll=roll) <CR>