What's the difference b/t a "density profile" or "temperature
profile" etc and just a basic density graph, temperature graph, etc?
Is a profile a graph over a chunk of space which is 2-dimensional plus
width-not-too-small /large, whereas a graph is just a 2-dimensional
plot, y vs. x, say.
Is this chunk what is called a slab, in numerical simulations?
And how does a spherically-average profile differ from a chunk or slab