gadem, vgadem: plasma emission, multi-temperature with gaussian distribution of emission measure.

A multi-temperature plasma emission model built on top of the apec or
mekal codes. The emission measure distribution is a gaussian with mean
and sigma given by the first two model parameters. The `switch`
parameter determines whether the apec or mekal codes will be used. For
the mekal code there are also the options to run the code for each
temperature or interpolate from a pre-calculated table. The former is
slower but more accurate. See the documentation on the apec model for
additional information on using different AtomDB versions or applying
thermal or velocity broadening.

For the gadem version, the abundance ratios are set by the abund command. The vgadem variant allows the user to define abundances for the more common elements. See the documentation on the apec model for information on using additional elements included in AtomDB.

The parameters for gadem are:

par1 | mean temperature for gaussian emission measure distribution |

par2 | sigma temperature for gaussian emission measure distribution |

par3 | nH (cm) |

par4 | abundance relative to Solar |

par5 | redshift z |

par6 | switch (0 = calculate using MEKAL model; 1 = interpolate using MEKAL model; 2 = interpolate using APEC model) |

norm | Normalization |

For the vgadem variant the parameters are:

par1 | mean temperature for gaussian emission measure distribution |

par2 | sigma temperature for gaussian emission measure distribution |

par3 | nH (cm) |

par4-17 | abundance relative to solar Abundances for He, C, N, O, Ne, Na, Mg, Al, Si, S,Ar, Ca, Fe, Ni wrt Solar (defined by the abund command) |

par18 | redshift z |

par19 | switch (0 = calculate using MEKAL model; 1 = interpolate using MEKAL model; 2 = interpolate using APEC model) |

norm | Normalization |