A data frame with 25 rows (one per person) and 4 columns:
- Willow
The (Julian) date on which flowering began for the
encroaching Salix (willows)
- Skypilot
The (Julian) date on which flowering began for the
native Polemonium viscosum (alpine skypilot)
- MinTemp
The minimum June temperature (in degrees C)
- Altitude
The altitude (in m)