Simfit test files usually have the following format

line 1: Title describing the data
line 2: Number of rows (n) and number of columns (m)
line k: for k = 3 to k = n + 2 ... data values in columns 1 to m

Data values can be as:
 a) simple integers, e.g., 1000 with no commas to indicate multiples of 1000 
 b) floating point numbers, e.g., 1000.0 with a decimal point but not a comma 
 c) scientific notation, e.g., 1.23456E+02 or just 1.23456E2 meaning 123.456    

Columns can be separated by spaces, commas, or semicolons, but tabs can be used if there are missing variables  

After the data section there can be either:
 a) nothing
 b) default data with either no meaning or special significance
 c) sections separated by begin{labels} ... end{labels} containing labels, e.g. for pie chart segments
 d) sections separated by begin{limits} ... end{limits} containing low/start/high vales for curve fitting                                         