File types

1) *_data.rds - Contain information on light data and - for some loggers - on pressure, acceleration and magnetism
	1.1 Light
	Columns:
	a) date
	b) obs (light intensity, arbitrary unit)

	1.2 Pressure
	Columns:
	a) date
	b) obs (pressure in hPa)

	1.3 Acceleration
	Columns:
	a) date
	b) pit (pitch on Z-axis angle)
	c) act (activity on Z-axis jiggle, arbitrary unit)

	1.4 Magnetism
	Columns:
	a) date
	b) gX,gY,gZ (snapshot tri-axial acceleration data)
	c) mX,mY,mZ (snapshot tri-axial magentic field data)

2) *_twl.csv files - Contain information (date & time) on classified twilight events (sunrise or sunset)

2) *_track.csv files - Coordinates (lon, lat) of migratory tracks with uncertainty

3) *_fittedmodels.rds - Final fitted Estelle model for the estimation of migratory tracks