Table:
Objects	Horizontal Rectification	Commonly Used Methods
Integrity (%)	Precision (RMSE)	Integrity (%)	Precision (RMSE)
Horizontal Objects	Roof 1	99.15%	10.1 cm	98.89%	15.2 cm
Roof 2	98.86%	18.1 cm	98.55%	21.5 cm

Parse the following content of the illustration in markdown code: | <ROWSPAN=2>  | <ROWSPAN=2> Objects | <COLSPAN=2> Horizontal Rectification | <COLSPAN=2> Commonly Used Methods | 
 | Integrity (%) | Precision (RMSE) | Integrity (%)

| Precision (RMSE) | 
 | --- | --- | --- | --- | --- | --- | 
 | <ROWSPAN=2> Horizontal Objects | Roof 1 | 99.15% | 10.1 cm | 98.89% | 15.2 cm | 
 | Roof 2 | 98.86% | 18.1 cm | 98.55% | 21.5 cm |