# Here is a more simple example of a data file
# one x,y coordinate per line
280.000000	9.355000  
280.500000	7.266000  
281.000000	4.799000  
281.500000	2.325000  
282.000000	0.201000  
282.500000	-1.355000 
283.000000	-2.318000 
283.500000	-2.806000 
284.000000	-3.006000 
284.500000	-3.090000 
285.000000	-3.167000 
285.500000	-3.260000 
286.000000	-3.338000 
286.500000	-3.366000 
287.000000	-3.337000 
287.500000	-3.270000 
288.000000	-3.182000 
288.500000	-3.083000 
289.000000	-2.983000 
289.500000	-2.892000 
290.000000	-2.807000 
290.500000	-2.697000 
291.000000	-2.520000 
291.500000	-2.266000 
292.000000	-1.978000 
292.500000	-1.720000 
293.000000	-1.531000 
293.500000	-1.419000 
294.000000	-1.382000 
294.500000	-1.420000 
295.000000	-1.515000 
295.500000	-1.610000 
296.000000	-1.624000 
296.500000	-1.490000 
297.000000	-1.198000 
297.500000	-0.812000 
298.000000	-0.414000 
298.500000	-0.028000 
299.000000	0.430000  
299.500000	1.115000  
300.000000	2.179000  
300.500000	3.707000  
301.000000	5.690000  
301.500000	8.003000  
302.000000	10.408000 
302.500000	12.608000 
303.000000	14.359000 
303.500000	15.576000 
304.000000	16.322000 
304.500000	16.711000 
305.000000	16.795000 
305.500000	16.537000 
306.000000	15.858000 
306.500000	14.711000 
307.000000	13.113000 
307.500000	11.162000 
308.000000	9.016999  
308.500000	6.860000  
309.000000	4.866000  
309.500000	3.159000  
310.000000	1.802000  
310.500000	0.789000  
311.000000	0.067000  
311.500000	-0.445000 
312.000000	-0.834000 
312.500000	-1.180000 
313.000000	-1.529000 
313.500000	-1.862000 
314.000000	-2.115000 
314.500000	-2.234000 
315.000000	-2.235000 
315.500000	-2.200000 
316.000000	-2.219000 
316.500000	-2.322000 
317.000000	-2.472000 
317.500000	-2.607000 
318.000000	-2.686000 
318.500000	-2.709000 
319.000000	-2.699000 
319.500000	-2.682000 
320.000000	-2.666000 
320.500000	-2.643000 
321.000000	-2.605000 
321.500000	-2.566000 
322.000000	-2.561000 
322.500000	-2.614000 
323.000000	-2.719000 
323.500000	-2.856000 
324.000000	-3.004000 
324.500000	-3.140000 
325.000000	-3.227000 
325.500000	-3.229000 
326.000000	-3.129000 
326.500000	-2.942000 
327.000000	-2.715000 
327.500000	-2.524000 
328.000000	-2.442000 
328.500000	-2.484000 
329.000000	-2.585000 
329.500000	-2.653000 
330.000000	-2.655000 
330.500000	-2.647000 
331.000000	-2.715000 
331.500000	-2.886000 
332.000000	-3.112000 
332.500000	-3.324000 
333.000000	-3.490000 
333.500000	-3.623000 
334.000000	-3.736000 
334.500000	-3.812000 
335.000000	-3.810000 
335.500000	-3.717000 
336.000000	-3.579000 
336.500000	-3.479000 
337.000000	-3.475000 
337.500000	-3.564000 
338.000000	-3.682000 
338.500000	-3.751000 
339.000000	-3.727000 
339.500000	-3.614000 
340.000000	-3.450000 
340.500000	-3.282000 
341.000000	-3.157000 
341.500000	-3.118000 
342.000000	-3.196000 
342.500000	-3.376000 
343.000000	-3.594000 
343.500000	-3.761000 
344.000000	-3.823000 
344.500000	-3.787000 
345.000000	-3.696000 
345.500000	-3.586000 
346.000000	-3.476000 
346.500000	-3.383000 
347.000000	-3.332000 
347.500000	-3.351000 
348.000000	-3.448000 
348.500000	-3.594000 
349.000000	-3.733000 
349.500000	-3.802000 
350.000000	-3.765000 
350.500000	-3.641000 
351.000000	-3.500000 
351.500000	-3.424000 
352.000000	-3.451000 
352.500000	-3.550000 
353.000000	-3.647000 
353.500000	-3.680000 
354.000000	-3.629000 
354.500000	-3.520000 
355.000000	-3.403000 
355.500000	-3.334000 
356.000000	-3.346000 
356.500000	-3.430000 
357.000000	-3.532000 
357.500000	-3.590000 
358.000000	-3.571000 
358.500000	-3.493000 
359.000000	-3.397000 
359.500000	-3.318000 
360.000000	-3.261000 
360.500000	-3.207000 
361.000000	-3.148000 
361.500000	-3.105000 
362.000000	-3.123000 
362.500000	-3.224000 
363.000000	-3.373000 
363.500000	-3.498000 
364.000000	-3.556000 
364.500000	-3.561000 
365.000000	-3.575000 
365.500000	-3.654000 
366.000000	-3.803000 
366.500000	-3.961000 
367.000000	-4.049000 
367.500000	-4.023000 
368.000000	-3.908000 
368.500000	-3.774000 
369.000000	-3.677000 
369.500000	-3.627000 
370.000000	-3.594000 
370.500000	-3.547000 
371.000000	-3.484000 
371.500000	-3.426000 
372.000000	-3.398000 
372.500000	-3.414000 
373.000000	-3.471000 
373.500000	-3.549000 
374.000000	-3.618000 
374.500000	-3.638000 
375.000000	-3.586000 
375.500000	-3.471000 
376.000000	-3.334000 
376.500000	-3.218000 
377.000000	-3.149000 
377.500000	-3.136000 
378.000000	-3.184000 
378.500000	-3.293000 
379.000000	-3.450000 
379.500000	-3.633000 
380.000000	-3.821000 
380.500000	-4.006000 
381.000000	-4.170000 
381.500000	-4.271000 
382.000000	-4.261000 
382.500000	-4.139000 
383.000000	-3.973000 
383.500000	-3.860000 
384.000000	-3.851000 
384.500000	-3.908000 
385.000000	-3.950000 
385.500000	-3.926000 
386.000000	-3.847000 
386.500000	-3.765000 
387.000000	-3.726000 
387.500000	-3.732000 
388.000000	-3.761000 
388.500000	-3.789000 
389.000000	-3.818000 
389.500000	-3.869000 
390.000000	-3.963000 
390.500000	-4.101000 
391.000000	-4.256000 
391.500000	-4.384000 
392.000000	-4.441000 
392.500000	-4.403000 
393.000000	-4.273000 
393.500000	-4.085000 
394.000000	-3.900000 
394.500000	-3.783000 
395.000000	-3.764000 
395.500000	-3.814000 
396.000000	-3.863000 
396.500000	-3.856000 
397.000000	-3.778000 
397.500000	-3.642000 
398.000000	-3.420000 
398.500000	-2.996000 
399.000000	-2.202000 
399.500000	-0.942999 
400.000000	0.673000  
400.500000	2.349000