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What is W in the brightness (intensity) distribution, please? Alpha is the position of the star; lambda, the wavelength; t, the time; P, the polarization. Thank you

enter image description here

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    $\begingroup$ If you can tell us where you found this, and perhaps provide some more context, it will be easier to help you. $\endgroup$
    – pela
    Nov 13, 2023 at 14:58
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    $\begingroup$ Context is essential... there are some rough conventions of which symbols are used for which physical properties - but that is anything but a given. That is more true the less common a formula is. And this is not even a formula, but just a function call, so that no-one can even draw conclusions from the formula. $\endgroup$ Nov 13, 2023 at 15:03
  • $\begingroup$ It was in a lecture about interferometry that in this all astrophysicists are interested. However, then it was talked just about the other variables as I described above. $\endgroup$
    – Anna-Kat
    Nov 14, 2023 at 6:10

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