Table:
Mg2+

Co2+

km (μM)

Vmax (pmol/min/108 cells)

km (μM)

Vmax (pmol/min/108 cells)

Ki(Mg2+) (μM)

MgtE

-

-

82[4] (at 37 °C)

354[4] (at 37 °C)

50[4] (at 37 °C)

CorA

15[38] (at 20 °C)

250[38] (at 20 °C)

30[2] (at 22 °C)

500[2] (at 22 °C)

10[2] (at 22 °C)

Your task is as follows:
In this table image, locate all merged cells and detail their regions using the JSON {'top-left':(X, Y), 'bottom-right':(Z, W)}. Here, '(X, Y)' and '(Z, W)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Keep in mind that row and column IDs start from 1.

The merged cell areas are as follows:
{'top-left':(1, 2), 'bottom-right':(1, 3)}
{'top-left':(1, 4), 'bottom-right':(1, 6)}.