The "Plasma" fractal type operates differently that all the other
types:

   - "Plasma" is completely random in nature, and as such does
     not have any X/Y-Coordinates.  In fact, the X/Y Coordinates
     window is disabled when you select this fractal type

   - The "Plasma" fractal is based completely on the existing screen
     palette when the "Draw" button is selected.  Random colors (within
     the screen palette) are selected as starting points.  The generation
     of the "Plasma" image is based upon averaged colors in relation to
     these starting points

     Note that these averaged colors are obtained via "best match"
     comparisons with the screens palette.  The current screen palette
     is NOT modified by "Plasma"

     Therefore, to obtain the BEST results, it is highly recommended that
     you set up the screen palette with spreads of two to four colors
     before starting the "Plasma" draw.  My PaletteTool program is very
     handy for doing this

   - The "Depth" slider does not relate to "iterative depth", but rather
     the degree to which the color "randomization" will deviate.  For
     example, if the Depth is set to 10, the randomized colors will deviate
     only within 10 Red/Green/Blue values (out of 256 possible)

     Assuming you've set up a screen palette with just a few color spreads,
     I've found that values between 250 and 350 yield the best results

   - Plasma fractals are excellent for use with color cycling.  For the
     best results:

        - Set up a spread between the first usable palette color and 
          the last usable palette color (try using White (R/G/B = 255)
          and Blue (B = 255; R/G = 0))

        - Render the Plasma fractal

        - Rotate the palette a few colors in either direction.  Create
          another spread which eases the transition between the White and
          Blue "boundry".  What you are trying to accomplish here is a
          completely "smooth" transition of color within the palette

        - Now cycle the palette

     You can experiment with rendering the Plasma fractal with the palette
     set to a spread between 2 colors (as indicated above), and then alter
     the palette once the Plasma fractal is rendered

As with all the other Fractal types, experiment to find the best results
for you!