JEB -- Yamawaki et al. 205 (4): 485 Figure IG1

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Fig. 1. (A) Diagram of the fly and host defining the variables used for the analysis. The angle of the fly’s longitudinal axis ( ${Phi}$ ) is measured relative to externally based coordinates. The angular position of the host head ( ${theta}$ _H) and tail ( ${theta}$ _T) are measured relative to ${Phi}$ . (B) Diagram of the fly in two frames to illustrate the fly’s movement, consisting of rotation ( ${Delta}$ ${Phi}$ ) and translation. Translation is resolved into two components, forward (F) and sideways (S).