Molecular gas toward the Gemini OB1 Giant Molecular Cloud Complex I:
  Observation data
  We present a large-scale mapping toward the GEM OB1 association in the
galactic anti-center direction. The 9^deg * 6.5^deg area was mapped in 12CO,
13CO, and C18O with 50" angular resolution at 30" sampling. The region was
divided into four main components based on spatial distribution and velocity:
the Gemini OB1 Giant Molecular Cloud (GGMC) Complex, the Lynds Dark Clouds and
the West Front Clouds, the Swallow and Horn, and the Remote Clouds. The GGMC
Complex is located in the Perseus arm, while the Lynds Dark Clouds and the West
Front Clouds are located in the Local arm. Swallow and Horn are revealed for
the first time in this paper. The two clouds have a similar velocity interval
([11, 21] km s^-1) and have similar sizes (0.6 and 0.8 deg^2). We analyzed the
structure of these clouds in detail and calculated their parameters (mass,
temperature, etc.). Two elongated structures were discovered in a
longitude-velocity map in the velocity interval [11, 30] km s^-1. We also found
an interesting filament that shows a 0.8 km s^-1 pc^-1 gradient perpendicular
to the direction of the long axis.
