Effect of new atomic data (Chianti ver. 7.1) on XRT response functions

The new version of Chianti (ver. 7.1) was released in October 2012. According to their announcement, the main part is the change by "the inclusion of a large number of configurations to the atomic models of Fe VIII to XIV. These configurations give rise to a forest of spectral lines in the 50-170 A wavelength range...". In response to this change, the XRT response functions were re-calculated using the latest version of atomic data.
Changes in response functions are found only in low temperatures (below 6MK). These changes appear most significant in Alminum filters (Al-poly, Al-mesh, med-Al, and thick-Al), and negligible in med-Be and thick-Be filters. As a result, ratio functions using thinner Alminum filters (C-poly/Al-poly, Ti-poly/Al-poly) suffer notable change below 6MK. The ratios between thick filters are less affected (see section 1 and 2).

A different type of abundance set, 'sun_coronal_2012_Schmelz.abund' was newly introduced, in addition to the original 'coronal', 'hybrid' and'photospheric' abundance sets. This new set is designated as a 'coronal' abuncances, but actually is an updated version of the 'hybrid' abundances. The comparison between traditioal hybrid (sun_hybrid_ext.abund) and the new one(sun_coronal_2012_Schmelz.abund) shows that the filter ratios from the latter set give slightly higher temperatures (see section 3).
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1. The Respnse functions.

The solar spectra were calculated with the latest Chianti version 7.1, 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_flux710(logte, f1,f2, tim, /corona)
IDL> flux_h7 = xrt_flux710(logte, f1,f2, tim, /hybrid)
IDL> flux_p7 = xrt_flux710(logte, f1,f2, tim, /photos)

Below are the response functions of all the X-ray analysis filters available at XRT. The calibration data released on 20-Aug-2010 was used for these calculation. It is known that the contamination accumulated on the CCD modifies the XRT response functions. As the amount of contamination varies with time, response functions are time-dependant. For the later convenience of analysis, the following response functions were calculated for the contamination level as of 12-Nov-2006.
Plots are clickable (i.e., click each plot to show more detailed info).

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

2. The Filter Ratios.

These plots shows that the Chianti ver 7.1 makes no sigificant difference in the filter ratio curves relative to those with version 6.0.1.
Again, plots are clickable (i.e., click each plot to show more detailed info).

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
thin-Be/Al-meshthin-Be/Ti-polythick-Be/thick-Al thick-Al/Ti-poly

3. Other changes.

According to the release note, the following addition/change were also made in the Chianti ver. 7.1.