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 Indian J Med Microbiol  
 

Figure 1: Landmarks and lines. Tracing procedures: 1. draw line A, tangent to O2, passing through O1; 2. draw line B, perpendicular to A, passing through Co, that intersects line A in C point; 3. draw line C, perpendicular to B, passing through C1; 4. draw line D, perpendicular to C, passing through D1, until it intersects line A (in D2 point); 5. draw O2-M; 6. draw M-Co line, that intersects line A in F point

Figure 1: Landmarks and lines. Tracing procedures: 1. draw line A, tangent to O2, passing through O1; 2. draw line B, perpendicular to A, passing through Co, that intersects line A in C point; 3. draw line C, perpendicular to B, passing through C1; 4. draw line D, perpendicular to C, passing through D1, until it intersects line A (in D2 point); 5. draw O2-M; 6. draw M-Co line, that intersects line A in F point