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Table C.2
Functions, operators, and distributions.
| Functions | Name | Meaning |
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| En(x) | nth Exponential integral |
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| Bν(T) | Planck function |
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| δ(x) | Dirac distribution |
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| Π(x) | Gate distribution | Π(x) = H(x + 1/2)−H(x−1/2) |
| Πa,b(x) | Generalized gate distribution (boxcar) | Πa,b(x) = Π((x−(b + a)/2(b−a))) |
| θ(x) | Heaviside distribution |
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| G | Green’s function | ℒG(x,s) = δ(x−s) |
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Integration of f weighted by a line profile |
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