It is in single backslash format.
When you look at any string in the debugger, it shows them with appropriate escape characters: "\n", "\t" and "\\" for newline, tab and a single backslash respectively.
If you think about it, it makes sense: if it didn't you would not be able to tell any difference between
A single line with a backslash and a lower case 'n' between the words, and
Two lines, one of "Hello" and one of "There"
In the debugger, these would be shown as: