Suppose NoRH image (indexr, datar) and SXT image (indexx,datax)
are given. If you align the SXT image to NoRH FOV10,
IDL> datax1=norh_sxt2norh(index,datar,indexx,datax) <CR>
In reverse, if you fit the NoRH image to SXT FOV,
IDL> datar1=norh_norh2sxt(index,datar,indexx,datax) <CR>