Dear native English speakers, Could you please help me check what I wrote? It has something to do with technical terms/knowledge(construction). I would appreciate your help ☺️. This double arrow line denotes the range of rebars to be installed. L denotes the length of the range. H(x)-y x denoted rebar diameter y denotes rebar spacing Take 4200x4200 drop panel for example, the cover for B3 drop panel is 50mm, the number of B1 rebar H40-150 required is calculated as below: (4200-50-50)÷150=27.33, rounded up to 28, hence 28+1=29H40 bars are required. N+2 denotes the number of rebar H(x)-y required. (N is an integer.)