reading a matrix from file

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Hello, 
I try to read a matrix from a file.
maxima_60.html#SEC212 says: 

Function: read_matrix (file_name)
Reads the file file_name and returns its entire content as a matrix. If separator_flag is not specified, the file is assumed space-delimited.

so i tried: 

load(numericalio);
read_matrix('d:/Robert/dki/001-Projekte/00_pvT/Versuche/WLF/WLF-all-const-pressure-multivar-matrix.txt');


this is a part of the file:
 280 0  0 0.251 
 260 0  0 0.237 
 240 0  0 0.231 
 220 0  0 0.229 
 200 0  0 0.236 
 180 0  0 0.232 
 160 0  0 0.227 
 140 0  0 0.228 
 120 0  0 0.231 


i do get this complains: 
All matrix rows are not of the same length.

how does maxima treat white-spaces? 



thanks for hints,
Robert