We complied the optical, X-ray, and {gamma}-ray data for 54 Fermi blazars and studied the relationship between the broadband spectral index {alpha}ox and {alpha}x{gamma}, as well as the relationship between the intrinsic composite spectral indices {alpha}xox and {alpha}{gamma}x{gamma} for this sample. The relationship between {alpha}xox and {alpha}{gamma}x{gamma} reveals that flat spectrum radio quasars and low-energy peaked BL Lacertae follow a continuous trend, which is consistent with previous results, whereas high-energy peaked BL Lacertae follow a separate distinct trend. Even so, a unified scheme is also revealed from {alpha}xox-{alpha}{gamma}x{gamma} diagram when all three subclasses of blazars are considered.

Cone search capability for table J/ApJ/709/1407/table1 (The sample of Fermi blazars with both {alpha}x and {alpha}{gamma})