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[en] A planer undulator consisted of 24 periods of an 85-mm length has been installed in a 2.7-m straight section of the SAGA-LS, in order to provide brilliant soft x-rays for advanced researches on nano-surfaces and interfaces at the Saga-university beamline BL13. The photon flux of 2x1011 photons/100 mA was obtained at 133 eV, and the available photon energy was beyond 800 eV using higher harmonics. The achieved resolving power of the varied-line-spacing (VLS) monochromator system was 8,670 at 130 eV with slits of 15 um. This agrees very well with the value of 8,790 expected from the ray-tracing calculation. The details in the performance tests will be reported, indicating the high performance of the beamline BL13 for photoelectron spectroscopy in the soft x-ray region.