Index   Lat_1   Lat_2   Lat_3
1       52.3    80      69
2       80      52.3    69
3       69      80      52.3
4       69      55.0    52.3

Index   Lat_1   Lat_2   Lat_3   Correct_lat
1       52.3    80.0    69.0    52.3
2       80.0    52.3    69.0    52.3
3       69.0    80.0    52.3    52.3
4       69.0    55.0    52.3    55.0