In response to the release of Chianti version 7.0 in October, 2011, the XRT response functions were re-calculated using the latest version. No significant difference so far found between the response function with version 6.0.1 and 7.0.

1. The Respnse functions.

The solar spectra were calculated with the latest Chianti version 7.0, for 'coronal', 'hybrid', and 'photospheric' abundances. Then I modified XRT_FLUX.PRO so that it can access the above spectrum files by setting the corresponding keyword.
IDL> flux_c = xrt_flux(logte, f1,f2, tim, /corona)
IDL> flux_h = xrt_flux(logte, f1,f2, tim, /hybrid)
IDL> flux_p = xrt_flux(logte, f1,f2, tim, /photos)
IDL> flux_c7 = xrt_flux700(logte, f1,f2, tim, /corona)
IDL> flux_h7 = xrt_flux700(logte, f1,f2, tim, /hybrid)
IDL> flux_p7 = xrt_flux700(logte, f1,f2, tim, /photos)

Below are the response functions of all the X-ray analysis filters available at XRT, as of 12-Nov-2006. Due to the contamination accumulated on the CCD, the XRT response functions are time-dependent.

Al-poly/OpenC-poly/Openthin-Be/Open med-Be/Openmed-Al/Open
Open/Al-mesh Open/Ti-polyOpen/thick-Al Open/thick-BeAl-poly/Ti-poly

3. The Filter Ratios.

These plots shows that the Chianti ver 7.0 makes no sigificant difference in the filter ratio curves relative to those with version 6.0.1.

C-poly/Al-polythin-Be/Al-polymed-Be/Al-poly med-Al/Al-polythin-Be/C-poly
med-Be/C-polymed-Al/C-polymed-Be/thin-Be med-Al/thin-Bemed-Al/med-Be
Al-poly/Al-meshTi-poly/Al-meshmed-Al/Ti-poly thick-Be/med-AlTi-poly/Al-poly