LegendTextSpace is an option for Legend, which specifies the space in the legend box for text.
PlotLegend is an option for Plot, ListPlot, and related functions that assigns text to lines in a 2D plot to create a legend for that plot.
ShadowBackground is an option for ShadowBox or Legend, which specifies the style for a drop shadow.
ShadowBorder is an option for ShadowBox, which specifies the style of the border around the rectangle above a shadow.
ShadowBox[{x, y}, {xlength, ylength}, options] generates a box with a drop shadow.
ShadowForeground is an option for ShadowBox, which specifies a style for the foreground of a shadow box.
ShadowOffset is an option for ShadowBox, which sets the offset of a shadow from the rest of the box.
IonStage
(Resonance Absorption Lines Package Symbol) IonStage is the ionization level of the element producing resonance absorption lines.
LowerTermFineStructureEnergy[element] gives a list of {wavelength_v, energy} pairs, where wavelength_v is the wavelength in vacuum and energy is the energy of the ...
VacuumWavelength[element] gives a list of the wavelengths in vacuum of the resonance absorption lines produced by the specified element.VacuumWavelength[element, ionstage] ...