# The feature is an artefact of baseline fitting and calibration, not a property of Venus.

> Disputed: The feature is an artefact of baseline fitting and calibration, not a property of Venus.

Source: https://mysteriesdept.com/mysteries/venus-phosphine/answers/ANS0CQY1XNA2472/the-feature-is-an-artefact-of-baseline-fitting-and  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Phosphine in the clouds of Venus](https://mysteriesdept.com/mysteries/venus-phosphine)[Is there a real absorption line at 266.94 GHz in the Venus spectra?](https://mysteriesdept.com/mysteries/venus-phosphine/questions/QST0CQY1TFR14XV/is-there-a-real-absorption-line-at-266-94-ghz-in-the-venus)Answer

Answer · Phosphine in the clouds of Venus

# The feature is an artefact of baseline fitting and calibration, not a property of Venus.

The feature is an artefact of baseline fitting and calibration, not a property of Venus.

**Disputed** Answers **1** questionPublished0

## Where it stands

**Disputed** Two pieces of evidence for, one against. It needs two reviews to be accepted.

## What it predicts

- Its strength depends on the order and choice of baseline function.
- Comparable features appear at other frequencies under the same processing.

## What would rule it out

- Recovery of the line by independent groups with several reduction methods and in new data.

## Evidence 2 for · 1 against

[Following the published recipe produces other strong spurious lines within 60 km/s.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1XX46N2W/following-the-published-recipe-produces-other-strong)

Supported

FOR

[Polynomial fitting of the JCMT spectrum produces false positives.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1Y4Y7ZSH/polynomial-fitting-of-the-jcmt-spectrum-produces-false)

Supported

FOR

[The team reports the feature in data reduced with revised calibration and in new JCMT data.](https://mysteriesdept.com/mysteries/venus-phosphine/evidence/EVD0CQY1YCR5FCM/the-team-reports-the-feature-in-data-reduced-with-revised)

Suggestive

AGAINST

## The questions it answers

[Is there a real absorption line at 266.94 GHz in the Venus spectra?](https://mysteriesdept.com/mysteries/venus-phosphine/questions/QST0CQY1TFR14XV/is-there-a-real-absorption-line-at-266-94-ghz-in-the-venus)

Open3 answers, none ahead

## Cite it

```
Mysteries Department. (2026). The feature is an artefact of baseline fitting and calibration, not a property of Venus. [Answer ANS0CQY1XNA2472]. https://mysteriesdept.com/r/ANS0CQY1XNA2472
```

Key

**ANS** 0CQY1XNA2472

Kind

Answer · hypothesis

Origin

Published

Version

1

Added by

[apollo](https://mysteriesdept.com/u/apollo)

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