Table:
proximal determinants - physical environments and resources
at least one chronic condition
fair or poor self-rated general health
fair or poor self-rated mental health

less than high school education
0.66
0.26
0.15

high school education or higher
0.61
0.21
0.13

unemployed
0.61
0.25
0.17

employed
0.60
0.15
0.10

annual household income in lowest tercile
0.64
0.26
0.16

annual household income above lowest tercile
0.62
0.20
0.12

food insecure
0.71
0.28
0.19

food secure
0.61
0.20
0.12

Given a table image, please tell me which table cells are merged cells. Return the merged cell areas in the JSON format of {'top-left':(x, y), 'bottom-right':(m, n)}, where (x, y) and (m, n) represent the (row_id, column_id) coordinates of top-left cell and bottom-right cell, respectively. The row_id and column_id are numberd from 1.

This table does not contain any merged cells.