| 31. | They observed several weak emission lines, which they presumed to be those of element 87.
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| 32. | The detection of these emission lines were an important early product of gamma-ray astronomy.
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| 33. | The distinction between these two connected populations explains the difference in emission line properties in blazars.
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| 34. | The Balmer equation predicts the four visible absorption / emission lines of hydrogen with high accuracy.
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| 35. | This class is distinguished by optical spectra devoid of the broad emission lines characteristic of quasars.
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| 36. | If synthetic quartz is used, then the emission line at 185 nm is observed also.
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| 37. | The'e'suffix is used for stars that show emission lines in their spectrum.
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| 38. | XeH has three known emission lines.
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| 39. | The lowest ionisation nitrogen emission lines are strongest, with N V lines being very weak.
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| 40. | The red emission line from neon also causes the well known red light of helium neon lasers.
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