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Homework Help: Graph scale confusion

  1. Mar 2, 2015 #1

    I have to estimate some values from a plot (shown in the attachment). The trouble is I'm not sure how to read one of the scales

    could someone please explain the nature of the scale along the top frame, the angular scale, i.e how it is spaced. One of my aims is to estimate which angle, roughly, the first peak corresponds to but I don't understand how the values between the 2 degrees and 0.5 degrees are spaced.

    Thanks a lot

    P.S the plot was taken from a technical paper regarding results from the WMAP experiment, which can be found at http://map.gsfc.nasa.gov/news/tp_links.html
  2. jcsd
  3. Mar 2, 2015 #2


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    There are several dozen technical papers at the link you gave.

    We'd like to help, but you should pick the paper with your plot and reference just that one paper. Give a page number so we don't have to hunt it up.
  4. Mar 2, 2015 #3
    Sorry, I should have referenced that better, this is a better link to follow


    and the paper where the plot came from is called

    Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmology Results
    Hinshaw, G.F., et.al., 2013, ApJS., 208, 19H

    the plot is fig.2 on page 8.

    Thanks again
  5. Mar 2, 2015 #4


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    Subject of a thread with the colleagues here. ##\theta = {180^\circ\over l}## with a caveat that it's not perfectly well-defined.
  6. Mar 3, 2015 #5
    Thanks, that was helpful.
  7. Mar 3, 2015 #6


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    Exciting subject !
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