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Number of digits after the decimal point (1)
Type of symbolization: 1: continuously from "bright to dark", 2: continously from "bright" to "mbright" and form "mdark" to "dark"; 3: nominal values. Use lookup to assign colors to values. (1; variant: coltype). New: mtyp=12: automatic selection of a colorscheme: if zmin<0 and zmax>0: mtyp=2; else mtyp=1.
Number of color scheme for sequential colors, mtyp=1. (100 to 118);
Number of color scheme for divergent colors, mtyp=2. (200-209, 401-420, 501-512)
Number of color scheme for nominal colors, mtyp=3. (300 to 308)
classes* (bottom, medium, top)
The 3 "class" values; Defaults: ([mean - factor_s * standardDeviation], [mean], [mean + factor_s * standardDeviation])
factor_s defines the width of the intervall between bottom and top (cf. classes). If factors is negative (e.g. -2.5) bottom and top lay at percentiles (2.5% of the values are below bottom and 2.5% are above top). (1.5)
colors* (white, bright, dark, black, missing, background, border, text)
Colors of the first color scheme (#ffff64, #ffff00, #ff0000, #a00000, #deffde, #dedeff, #000000, #000000: yellow to red)
bicolors* (white, bright, mbright, mdark, dark, black, missing, background, border, text)
Colors of the second color scheme (#a00000, #c70000, #debebe, #bedebe, #00aa00, #009600, #ffffff, #f6f6f6,#000000, #000000: red to reddish gray and greenish gray to green)
Parameter for the transition from bright to dark
background* / bibackground* / nomibackground*
Color of the map background for the 3 color schemes (#dedeff / #f6f6f6)
text* / bitext* / nomitext*
Color of the legend text (#000000 / #000000)
fehlend* / bifehlend* / nomifehlend*
Color of the areas with missing values (#ffdeff / #ffffff)
border* / biborder* / nomiborder*
Color of the polygon boundaries (#000000 / #000000)
Areal units with or without border lines (0 / 1)
Feature for nominal data: Triples of number, legend text, and color. Example: <param name="lookup5" value="1,low, #4400c7,2,medium, #069696,3,high, #c70044">: the 5th variable consists of the values 1, 2, and 3. "1" means "low" and gets a blue color. Values with no explicitly defined color get random colors and do not appear in the legend (as such with the name starting with "$$").
Defining the size of the circles (in the case of absolute values); 2 variations:

(value / radius / bias / exponent / minval): An areal unit with a value of "value" becomes a circle with radius "radius". Values lower then "minval" were not drawn. Area proportional symbols get an exponent of 2.0, a variant could be 3.0 (cubic). Bias: A value which is added to the value of each areal unit. 

(-percentage / bias / exponent / minval)
If the first parameter value is negative, the total area of all circles covers about "percentage" of the map.