The file has no header row, so line one is already real data. When Excel or Google Sheets opens it, it assumes that first line is the column names and turns your very first reading into labels. No error, no warning. You’re down a sample and you’d never know.
The same file has a second trap: the timestamps occasionally jump backwards or skip a beat. Try to line things up by time and the ordering breaks. I sort by the row number and ignore the timestamps for ordering.
For the record, the eleven columns are: a sample counter, then the voltage for CP3 C3 F5 PO3 PO4 F6 C4 CP4 in that exact order, then one column that’s always empty, then the timestamp. The eight names are colour coded to match the console everywhere on this site; the key sits with the primer.
Try this instead: Sort by row number, never by time. And if you’re loading it in code, declare the columns yourself instead of letting the program guess.
Sources
My own data: three recorded console sessions (248,320 samples), an audit of seventeen training experiments, and the Notion console and sensor references.
