cd Filter; 
ds9 acisf19004N001_evt2.fits  -scale log -bin to 4 & 


import -window "SAOImage ds9" ds9_03_filter_01.png 
display < ds9_03_filter_01.png

xpaset -p ds9 bin filter 'energy=2000:7000'

xpaset -p ds9 smooth yes
xpaset -p ds9 smooth radius 4
xpaset -p ds9 cmap grey
xpaset -p ds9 cmap invert

import -window "SAOImage ds9" ds9_03_filter_02.png 
display < ds9_03_filter_02.png

xpaset -p ds9 quit