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set a 0.020
puts a
proc FORMAT { u } {
if { [expr $u*10] == [expr int($u*10)] } {
set u [format "%.1f" $u]
} elseif { [expr $u*100] == [expr int($u*100)] } {
set u [format "%.2f" $u]
}
}
set a [FORMAT $a]
puts $a
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