URL：https://www.researchgate.net/profile/Val-Runge/publication/8999518/figure/fig1/AS:11431281114395565@1674478810838/top-Conventional-spiral-out-and-bottom-spiral-in-out-gradients-The-blue-and-red_Q320.jpg
掲載元：https://www.researchgate.net/figure/top-Conventional-spiral-out-and-bottom-spiral-in-out-gradients-The-blue-and-red_fig1_8999518
