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A-Vectors are used in the FIRAS destriping process, as discussed in the FIRAS Explanatory Supplement (especially section 7.1). The values (in MJy/sr) are derived from the full covariance matrix as described in subsection 7.1.2 and represent frequency-frequency correlations. 6 FITS files are available, corresponding to the FIRAS modes HRES, HIGH, LOWF and HIF(3 files). FITS headers are listed in the FIRAS Explanatory Supplement Appendix G.

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