Table:
Vessel
Captor
Date
Location

Porpoise

Raritan

23 January 1845

Rio de Janeiro

Albert

Bainbridge

June 1845

Bahia

Laurens

Onkahye

23 January 1848

Rio de Janeiro

A.D. Richardson

Perry

11 December 1848

Rio de Janeiro

Independence

Perry

13 December 1848

Rio de Janeiro

Susan

Perry

6 February 1849

Rio de Janeiro

Provide me with the row number and column number for the table shown in this image. Format your final answer as a JSON, using the structure {"row_number": "m", "column_number": "n"}.

This table has 7 rows and 4 columns. Thus, the final answer is {"row_number": "7", "column_number": "4"}.