Covariance Matrix

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The Covariance Matrices express all frequency-to-frequency variances in the calibrated spectra, including correlation effects induced by apodization prior to taking the Fourier transform, in units of (MJ/sr)^2. Covariances with instrument characteristics such as calibration source temperatures are included as well. For a full discussion, see the FIRAS Explanatory Supplement (especially subsection 7.1.2). 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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