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An introduction to exoplanets
An introduction to exoplanets

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Figure 20  GJ 1214 b transmission spectrum. The measurements are shown as black circles (with error bars). The coloured lines are models for different atmosphere compositions used as a comparison. The changes in transit depth are so small that they are measured in a unit called ‘parts per million’ (ppm) – ten thousand times smaller than our more familiar percentage measure (‘parts per hundred’).

 4.2 The small ones: GJ 1214 b and GJ 1132 b