Remove minus sign from time residual. Closes #26

scripts/time_residuals.py

@@ -53,7 +53,7 @@ def main():
                 t_res = _df[_df.floor == floor].t_res
                 t_res = t_res[np.abs(t_res) < 500]
                 print(f"   DU {du} floor {floor}: {len(t_res)} entries")
-                ax.hist(-t_res,
+                ax.hist(t_res,
                         bins=100,
                         histtype='step',
                         lw=2,