/usr/share/xfig/Libraries/ProcessFlowsheet/ is in xfig-libs 1:3.2.6a-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xfig/Libraries/ProcessFlowsheet/Absorbtion.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Blower.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/CentrifugalPump.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Column.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Compressor.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Conv_down.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Conv_horizontal.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Conv_up.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/CoolingTower.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/DI.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/FI.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/FI_Number.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Flame.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Flash.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Down.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Down2.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Horizontal.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Left.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Right.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Right2.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_U-form.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Up.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HE_Vertical.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/HorizontalVessel.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/In-Outlet.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Kompressor.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/MainFlow_In-Outlet.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/MainStream.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Named_In-Outlet.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/PI.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/PI_Number.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Pump.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/QI.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/README
/usr/share/xfig/Libraries/ProcessFlowsheet/Ship.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Stack.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/StirredVessel.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Stream.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/TI.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Tank.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Truck.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Turbine.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Valve_horizontal.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/Valve_vertical.fig
/usr/share/xfig/Libraries/ProcessFlowsheet/VerticalVessel.fig