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documentation/spherex_data_products.md

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@@ -27,7 +27,7 @@ The SPHEREx focal plane is split with a dichroic to three short-wavelength and t
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* Band 4: λ= 2.42 - 3.82 µm; R=35
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* Band 5: λ= 3.83 - 4.41 µm; R=112
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* Band 6: λ= 4.42 - 5.00 µm; R=128
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2. **FLAG** - Bitmap of per-pixel status and processing flags, stored as a 2040 x 2040 image. The definition of the flags are provided in Table 8 of the [SPHEREx Explanatory Supplement](https://irsa.ipac.caltech.edu/data/SPHEREx/docs/SPHEREx_Expsupp_QR_v1.0.pdf).
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3. **VARIANCE** - Variance of calibrated surface brightness flux in units of (MJy/sr)^2, stored as a 2,040 x 2,040 image.
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*Filename Format:*
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- 'level2_[Observation ID]_D[Detector]_spx_l2b_v[Version]_[Processing Date].fits'
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- `level2_[Observation ID]_D[Detector]_spx_l2b_v[Version]_[Processing Date].fits`
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*Example:*
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*Example:*
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- `abs_gain_matrix_D1_spx_cal-agm-v4-2025-161.fits`
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### Calibration Product: Exposure-Averaged Point Spread Functions (PSFs)
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The Exposure-Averaged Point Spread Functions (PSFs) are ~6 MB FITS cubes (one for each detector) with dimensions 101 × 101 × 121. Each of the 121 layers represents a "super-resolution" PSF estimate in a different region (defined by an 11x11 grid) of the detector. Each PSF is a two-dimensional array with size of 101 × 101 pixels. The PSFs are oversampled such that 10 PSF pixels cover the same spatial extent as one spectral image pixel (0.615 arcsec).
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*Example:*
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- `average_psf_D1_spx_cal-psf-v4-2025-161.fits`
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### Calibration Product: Dark Current
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The Dark Current products are ~16 MB FITS image files (one per detector) with dimensions 2,040 x 2,040 and units of electron/s.
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### Additional Product: Spectral WCS
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The Spectral WCS products are ~32 MB multi-extension FITS files (one per detector). Each file has 3 extensions: CWAVE, CBAND, and WCS-WAVE.
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The Spectral WCS products are ~32 MB multi-extension FITS files (one per detector). Each file has 3 extensions: CWAVE, CBAND, and WCS-WAVE.
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CWAVE is an image with dimensions 2,040 x 2,040. It contains the central wavelength in microns for each pixel.
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*Example:*
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- `rspectral_wcs_D1_spx_base-2025-158.fits`
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