140 sb = np.abs(np.random.randn(nb))  variable
141 sb = sb / np.sum(sb)  variable
167 sb = np.abs(np.random.randn(nb))  variable
168 sb = sb / np.sum(sb)  variable
174 sb = (1-d)*sb + d  variable
180 sb = np.log(sb)  variable
340 sb = np.random.randn(nb)  variable
349 sb = np.random.randn(nb)  variable
358 sb = np.random.randn(nb)  variable
367 sb = np.random.randn(nb)  variable
489 sb = np.random.randn(nb)  variable