Bad
create_chart QList(QPointF(-26.957,2), QPointF(-23.022,3)) -30 -20 1 5 ch= QChart(0x562fe116b500, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges))

Good
create_chart QList(QPointF(2,-26.957), QPointF(3,-23.022)) 1 5 -30 -20 ch= QChart(0x562fe10c5c10, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges))
6.4.2 xcb QList()

 drawBestFitLine QChart(0x562fe116b500, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges)) clipRect= QRectF(0,0 504.258x576.5) true bestFitLineParams= 0.25413 8.85057
drawBestFitLine x1/y1 0 8.85057 p1 QPointF(1512.77,-554.964) true
drawBestFitLine x2/y2 1 9.1047 p2 QPointF(1563.2,-591.59) true
drawBestFitLine draw maxLength= 290705

 drawBestFitLine QChart(0x562fe10c5c10, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges)) clipRect= QRectF(0,0 498.898x576.5) true bestFitLineParams= 3.935 -34.827
drawBestFitLine x1/y1 0 -34.827 p1 QPointF(-124.725,854.777) true
drawBestFitLine x2/y2 1 -30.892 p2 QPointF(0,627.924) true
drawBestFitLine draw maxLength= 287615

 drawBestFitLine QChart(0x562fe116b500, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges)) clipRect= QRectF(0,0 504.258x576.5) true bestFitLineParams= 0.25413 8.85057
drawBestFitLine x1/y1 0 8.85057 p1 QPointF(1512.77,-554.964) true
drawBestFitLine x2/y2 1 9.1047 p2 QPointF(1563.2,-591.59) true
drawBestFitLine draw maxLength= 290705

 drawBestFitLine QChart(0x562fe10c5c10, pos=0,0, flags=(ItemUsesExtendedStyleOption|ItemSendsGeometryChanges)) clipRect= QRectF(0,0 498.898x576.5) true bestFitLineParams= 3.935 -34.827
drawBestFitLine x1/y1 0 -34.827 p1 QPointF(-124.725,854.777) true
drawBestFitLine x2/y2 1 -30.892 p2 QPointF(0,627.924) true
drawBestFitLine draw maxLength= 287615