| Quantity | Observed Range | Reference |
 |  | Reynolds (1989),(1985a). |
 |  | Reynolds & Tufte (1995). |
 | 0.2 - 0.5 | Reynolds (1985a). |
 | 0.2 - 0.5 | Reynolds et al. (1977),Ogden & Reynolds (1985). |
 |  | Reynolds (1990a). |
Model results of the diffuse interstellar gas (DIG).
Plotted are the average values, over approximately the first 
out of the plane, of the electron temperature 
, the
ratio, the ratio, and the
ratio as a function of the stellar effective temperature 
. The hardness of the ionizing spectrum is also described by
which is shown at the top of each figure.
N.B., the effective temperature only determines the shape of the
incident continuum and not the overall intensity, which is constrained
by the observed number of hydrogen ionizing photons in the DIG. Each
panel has two curves: the solid line (filled circles) includes the
additional turbulent heating term, while the dashed line (filled
triangles) excludes this term. The vertical lines correspond to the
variation in the mean values. Regions which are excluded
observationally have been shaded gray (see Table 1). (a) a total
hydrogen density of 
. (b) a total hydrogen density of
.
