Fig.1

a.) Center of tunnel: Belt off+B.L. suct. off

STD-VALUES

   --X_STD--    --Y_STD-- --X_ERRORBAR--
  0.71654510   1.50000000   0.01019534
  0.93677538  11.30000000   0.01019534
  1.00363860  31.30000000   0.01019534
  1.00375732  31.50000000   0.01019534
  1.00617364  51.50000000   0.01019534
  1.01283032 101.50000000   0.01019534
  1.01378928 151.50000000   0.01019534
  1.01377667 216.50000000   0.01019534
