Crosses over (above) — Greater than on the current bar but less than or equal to on the previous bar (crosses above can also be used)
a cross over b эквивалентно a > b and a[1] <= b[1]
Crosses under (below) — Less than on the current bar but greater than or equal to on the previous bar (crosses below can also be used)
a cross under b эквивалентно a = b[1]
