Observations of CB4. Digitized Sky Survey (DSS) red, Herschel SPIRE 250 μm, ¹²CO (J = 2−1), ¹³CO (J = 2−1), C¹⁸O (J = 2−1), and N₂H⁺ (J = 1−0). The gray circles in the lower right corners indicate the respective beam sizes. The square marker indicates the center of the starless core. The dashed contour marks N_H = 10²¹ cm^-2. The white circles indicate the regions of which 1D-profiles were obtained by azimuthally averaging.