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Table 1.

Transducer placements

Accelerometers
Differential pressure sensors
±250 g
±50 g
ABABAB
Acceleration-compensated experiments       
   Inner tail Left inner tail (R2), mid-feather Right inner tail (R2), mid-feather Right S3* base Left R2 base Right R2 base 
   Outer tail Left outer tail (R5), mid-feather Right outer tail (R5), mid-feather Right S3* base Left R5 Right R5 
   Right wing P8, 25 mm from base S3, 25 mm from base Right P8 base Right S3* base 
Non-acceleration-compensated experiments       
   P8P7 Left P8 mid Left P7 base (Right P8 base) (Right S3 base) Left S3* base 
   P4P3 Left P4 base Left P3 mid (Right P8 base) (Right S3 base) Left S3* base 
   S1S2 Left S1 base Left S2 mid (Right P8 base) (Right S3 base) Left S3* base 
   S6S7 Left S6 mid Left S7 base (Right P8 base) (Right S3 base) Left S3* base 
Accelerometers
Differential pressure sensors
±250 g
±50 g
ABABAB
Acceleration-compensated experiments       
   Inner tail Left inner tail (R2), mid-feather Right inner tail (R2), mid-feather Right S3* base Left R2 base Right R2 base 
   Outer tail Left outer tail (R5), mid-feather Right outer tail (R5), mid-feather Right S3* base Left R5 Right R5 
   Right wing P8, 25 mm from base S3, 25 mm from base Right P8 base Right S3* base 
Non-acceleration-compensated experiments       
   P8P7 Left P8 mid Left P7 base (Right P8 base) (Right S3 base) Left S3* base 
   P4P3 Left P4 base Left P3 mid (Right P8 base) (Right S3 base) Left S3* base 
   S1S2 Left S1 base Left S2 mid (Right P8 base) (Right S3 base) Left S3* base 
   S6S7 Left S6 mid Left S7 base (Right P8 base) (Right S3 base) Left S3* base 

R indicates a rectrice (tail feather), with numbers indicating feathers (of 6) from the centre. P indicates a primary feather, S indicates a secondary feather, and numbering counts from the primary/secondary boundary (thus, given there are 10 visible primaries in an adult pigeon wing, P8 is the third visible primary from the wing tip).

S3* indicates the synchronising accelerometer. X indicates the sensor was not used for a given set-up. Values from sensors shown in parentheses (those on the right wing for non acceleration-compensated experiments) were measured but are not discussed here.

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