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Closer analysis of the paper methodology shows that microfilm versions of fashion magazines printed between 1946 and 2011 were examined for full-frontal photographs of models or actresses taken in the Frankfort plane. This position was considered important because even a relatively minimal head turn or tilt will change the apparent eyebrow characteristics.
Images were excluded if eyes were closed, squinting, or there was any visible forehead rhytids. Appropriate photographs were broken into 7 blocks of time for analysis: 1946-1955, 1956-1965, 1966-1970 (the hippie era), 1971-1980, 1981-1990, 1991-2000, and 2001-2011. A line was drawn between the lateral canthus (LC) to set a true horizontal. This line usually crossed the inferior pupil. A digital caliper was then used to draw a line 90° perpendicular to this up to the eyebrow peak.
The position of the brow peak in relation to the palpebral fissure was recorded as falling at one of 4 locations. The brow take-off angle between the true horizontal and this vector was measured using a digital caliper. Finally, the height of the brow above the LC was calculated in millimetres.