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Final Datasets for HD4174



Dataset Range Texp MJD QF
UVSUM_1M_52514 FITS ETC 1150-3118 4172 52514 94
UVSUM_2M_52563 FITS ETC 1150-3118 4082 52563 83
UVSUM_3M_52630 FITS ETC 1150-3118 6310 52630 40
UVSUM_4M_52657 FITS ETC 1150-3118 5760 52657 77
UVSUM_5M_52676 FITS ETC 1150-3118 6430 52676 88
UVSUM_6M_52686 FITS ETC 1150-3118 6366 52686 89
UVSUM_7M_52851 FITS ETC 1150-3118 3950 52851 97

Notes. Range is in Å. Texp is maximum monochromatic exposure (seconds), accounting for coadditions and splices. MJD is first start date of a sequence. "QF" is a quality factor (0-100).


Preview. In main panel, first spectrum is blue and its photometric error (2σ) red. For additional spectra, second is green and its photometric error orange; third is black, and color coding repeats for n>3. Only first two error curves are shown. Flux density and error tracings were heavily smoothed for display. Fluxes are clipped at photometric error. For weak spectra, error tracing dominates. Highly structured error curve tracks rapidly varying "echelle ripple" sensitivity.

Right panel depicts observation time line. Each exposure start is marked by a vertical bar spanning λ range of mode (bottom of frame is 1000 Å; top, 3300 Å). Gray shading delimits FUV modes; upper unshaded zone, NUV. Color coding: orange E140M, blue E140H, green E230M, red E230H.


Data table. Dataset column drills down to next layer: contributing exposures. Bottom-most level: o-type subexposures (if n>1). FITS returns FITS file containing data products. EXTEN=0 is header describing target, observation, and processing history (if applicable). EXTEN=1 holds wavelength, flux, photometric error, and data quality flag. If dataset is o-type with two or more subexposures, EXTEN=1 is coadded spectrum, subexp 1 is in EXTEN=2, subexp 2 in EXTEN=3, and so forth.


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