[O] About range references in the spreadsheet

[Xue Fuqiao]

In (info "(org) References"), there is an example explaining the range
references:

     @-1$-2..@-1   3 numbers from the column to the left, 2 up to
current row

What does `2 up to current row' mean?  I don't understand.  IIRC `@' represents 
row, it should be `1 up to current row'.
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Best regards.