Hi
The condition to add to your backing trigger is:
and selections trigger expression g_ticks(back_price,lay_price) is equal or less than 5
if you are using version 6, if I remember correctly the syntax is:
AND Trigger Expression g_ticks(back_price,lay_price) is equal or less than 5
Explanation from manual:
g_ticks(price1, price2)
Returns the difference between price1 and price2 in ticks. If price1 is less than price2, the result will be positive, otherwise - negative. Examples:
g_ticks(2, 3) = 50
g_ticks(4, 3.5) = -10
g_ticks(6, 6) = 0