Function remove_rows(a, b) removes rows from a+1 to b

[fulvio-nrg]

Good day,
I am writing a Python script in the SNAP Python working environment to work with variable tables.
In particular, I am working with the function " .remove_rows(a, b) " to remove row in the range a-b, as indicated also in the built-in example.
However, it seems that the function removes in fact rows form a+1 to b.

In the example below, I want to remove rows 10 to 20 from a table of 30 rows and two columns:

Row 10 corresponds to index 9 and row 20 corresponds to index 19. As indicated in the example of a usage of said function, I am using those indices as show in the script pasted below:

However, the end result is a table in which rows 11-20 have been removed, as shown below:

It seems therefore that the function " .remove_rows(a, b) " removes in fact rows from a+1 to b, and not from a to b as one might think.

Regards,
Fulvio