[R] column name prefix 'x' after data import via read.delim

[e-letter]

Readers,

The function 'read.delim' was used to import data into R:

columnnamea columnnameb columnnamec
1 2 3
2 3 4
3 4 5

After import, the column names were:

X.columnnamea columnnameb columnnamec

Why did this occur?

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r2151