Upload an IUE SWP spectrum (.txt) or load the demo to run the diagnostic fitting pipeline.
Supported format: two-column wavelength · flux text file.
Spectrum: —
—
Graph 1 — Rest-frame spectrum
observed flux · power-law continuum · shaded: continuum windows
Residual plot — whole spectrum
data − continuum − all fitted lines · each line's window shaded in its own colour
Emission-line summary
click a row to inspect the line · spectral index and amplitude are shown above (one continuum per spectrum)
| Line | Rest λ (Å) | Fitted λ (Å) | σ (Å) | FWHM (km/s) | Flux | Flux Err | EW (Å) | SNR | Window (Å) | Min λ | Max λ | Reduced χ² | Status |
|---|
Graph 2 — Line fit
data ± 1σ · Gaussian + local continuum
Graph 3 — Residuals (F − M)/σ
Graph 4 — Residuals vs N(0,1)
Fit parameters (±1σ)
| Rest λ | — |
| Centre μ | — |
| Offset Δλ / velocity | — |
| Amplitude A | — |
| σ | — |
| FWHM | — |
| FWHM (km/s) | — |
| Flux √(2π)Aσ | — |
| Broad component flux | — |
| Narrow component flux | — |
| Broad / narrow FWHM (km/s) | — |
| Equivalent width | — |
| Significance F/σF | — |
| Reduced χ² | — |
| Window W (min–max) | — |
Verification — statistical checks of the selected line —
Graph 5 — Variability context of this spectrum —
| Line | This spectrum F | Year F̄ | (F − F̄)/F̄ | N (year) | Fvar (year) | ± err | Regime |
|---|
Graph 6 and all lines — compare and download selected lines —
Graph 6 — Full-spectrum decomposition
each selected line's Gaussian in its own colour
Campaign reference — Fvar per emission line, per year (all dated spectra)
Computed offline by
run_variability.py: every spectrum in spectrum/ is fitted with this
pipeline, dated from jd.xlsx, and the detected (≥3σ) fluxes of each line are grouped by calendar year.
Fvar = √(σ²F − ΔF̄²) / F̄; error √(1/2N)·ΔF̄²/(F̄²Fvar) when σ²F/ΔF̄² <
10, else √(ΔF̄²/N)/F̄ (Vaughan et al. 2003; Sukanya et al. 2018).
The fitted spectrum above is placed in this table in Graph 5.
| Line | Year | N | JDmin | JD span (d) | F̄ | ΔF̄ (rms err) | σ²F/ΔF̄² | Fvar | ± err | Regime |
|---|---|---|---|---|---|---|---|---|---|---|
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