for example gu yesterday...
first magenta line 1.5569
you should place PO sell limit above 1.5569 : 1.5580, 1.6000, 1.6020, 1.6050 (use the same lot or martiangle)
second magenta line 1.5419
you should place PO buy limit below 1.5419 : 1.5400, 1.5380, 1.5350, 1.5320 (use the same lot or martiangle)