# 3.1.10. Elim: set flux energy limits¶

## 3.1.10.1. Overview¶

SPEX offers the opportunity to calculate the model flux in a given energy interval for the current spectral model. This information can be viewed when the model parameters are shown (see section Par: Input and output of model parameters).

For each additive component of the model, the following quantities are listed:

• the observed photon number flux ( ) at earth, including any effects of galactic absorption etc.

• the observed energy flux () at earth, including any effects of galactic absorption etc.

• the intrinsic number of photons emitted at the source, not diluted by any absorption etc., in .

• the intrinsic luminosity emitted at the source, not diluted by any absorption etc., in W.

The following units can be used to designate the energy or wavelength range: keV (the default), eV, Ryd, J, Hz, Å, nm.

## 3.1.10.2. Syntax¶

The following syntax rules apply:

elim #r1:#r2 [#a] : Determine the flux between #r1 #r2, in units given by #a, and as listed above. The default at startup is  keV. If no unit is given, it is assumed that the limits are in keV.

Warning

When new units or limits are chosen, the spectrum must be re-evaluated (e.g. by giving the “calc” command) in order to determine the new fluxes.

Warning

The lower limit must be positive, and the upper limit must always be larger than the lower limit.

## 3.1.10.3. Examples¶

elim 0.5:4.5 : give fluxes between 0.5 and 4.5 keV
elim 500:4500 ev : give fluxes between 500 and 4500 eV (same result as above)
elim 5:38 a : give fluxes in the 5 to 38 Å wavelength band