FUV continuum and H₂ fluorescence emission in LDN 1780; upper left panel: SPEAR/FIMS FUV continuum map with B band surface brightnes contours overlayed; upper right panel: the SPEAR/FIMS H₂ fluorescence emission map + B band contours; lower left panel: total (red line) and continuum (blue dashed line) intensities shown as function of the declination along the path from south to north; lower right panel: H₂ intensity(red line) and its statistical error (blue dashed line) along the same path across LDN 1780. The intensity unit for the total and continuum is photons cm⁻² s⁻¹ sr⁻¹ Å⁻¹ (CU; continuum unit) and for the line emission photons cm⁻² s⁻¹ sr⁻¹ (LU; line unit).