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$^{-3}$)
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$^{-3}$)
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