diff --git a/doc/src/graphics/catalogs.ag b/doc/src/graphics/catalogs.ag
deleted file mode 100644
index b4816d11a9ab039981ffb533b19e66be85022140..0000000000000000000000000000000000000000
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- TXTXYOFF <-2 94>
- T_PNTS (0,94)(0,0)(397,0)(397,120)(0,120)(0,94)(397,94)
- .STR
- L_SPACE 250
- "LIBPQ"
- .LINE AT (997,1712)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1
- V_SPACE <0 250 0>
- SIZE 180000 MARGINS <125 125 250 62>
- PNTS (0,0)(0,266)
- END .GRP
- END .GRP
-END .GRP
-.GRP
- .GRP
- .ELL AT (2255,126)
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (1594,1154)(0,1154)(0,0)(1594,0)(1594,1154)
- .RECT AT (2495,388)
- PNTS (1139,0)(0,0)(0,273)(1139,273)(1139,0)
- .TXT AT (2616,483)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- T_PNTS (0,94)(0,0)(901,0)(901,97)(0,97)(0,94)(901,94)
- .STR
- L_SPACE 250
- "POSTMASTER"
- .ELL AT (2238,468)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (0,0)(119,0)(119,119)(0,119)(0,0)
- .LINE AT (2344,528)
- PNTS (146,0)(0,0)
- .TXT AT (2769,1099)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- TXTXYOFF <-7 95>
- T_PNTS (0,95)(0,0)(600,0)(600,98)(0,98)(0,95)(600,95)
- .STR
- L_SPACE 250
- "server host"
- END .GRP
- .GRP
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1
- V_SPACE <0 250 0>
- SIZE 180000 MARGINS <125 125 250 62>
- .TXT AT (672,717)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <0 0 0 0>
- TXTXYOFF <-3 95>
- T_PNTS (0,95)(0,0)(572,0)(572,97)(0,97)(0,95)(572,95)
- .STR
- L_SPACE 250
- "client host"
- .ELL AT (112,125)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (1594,848)(0,848)(0,0)(1594,0)(1594,848)
- .GRP
- V_SPACE <0 250 0>
- SIZE 180000 L_SPACE 250 MARGINS <125 125 250 62>
- .RECT AT (354,333)
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (1139,0)(0,0)(0,273)(1139,273)(1139,0)
- .TXT AT (555,335)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- TXTXYOFF <0 92>
- T_PNTS (0,92)(0,0)(263,0)(263,262)(0,262)(0,92)(263,92)
- .STR
- L_SPACE 250
- "User\nApp"
- .TXT AT (1056,413)
- L_SPACE 139
- TXTXYOFF <-1 94>
- T_PNTS (0,94)(0,0)(398,0)(398,119)(0,119)(0,94)(398,94)
- .STR
- L_SPACE 250
- "LIBPQ"
- .LINE AT (981,334)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1
- V_SPACE <0 250 0>
- SIZE 180000 MARGINS <125 125 250 62>
- PNTS (0,0)(0,266)
- END .GRP
- END .GRP
-END .GRP
-.LINE AT (1496,476)
- R_ARROW 3
- PNTS (0,0)(747,46)
-.TXT AT (129,2424)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 R_ARROW 0
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <0 0 0 0>
- TXTXYOFF <-6 95>
- T_PNTS (0,95)(0,0)(2084,0)(2084,126)(0,126)(0,95)(2084,95)
- .STR
- L_SPACE 250
- "(b) postmaster creates backend server"
-.TXT AT (130,3778)
- L_SPACE 139
- T_PNTS (0,95)(0,0)(2265,0)(2265,120)(0,120)(0,95)(2265,95)
- .STR
- L_SPACE 250
- "(c) frontend connected to backend server"
-.GRP
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1
- V_SPACE <0 250 0>
- SIZE 180000 MARGINS <125 125 250 62>
- .ELL AT (2265,5432)
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (1594,1154)(0,1154)(0,0)(1594,0)(1594,1154)
- .RECT AT (2505,5694)
- PNTS (1139,0)(0,0)(0,273)(1139,273)(1139,0)
- .TXT AT (2626,5789)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- TXTXYOFF <-2 94>
- T_PNTS (0,94)(0,0)(900,0)(900,97)(0,97)(0,94)(900,94)
- .STR
- L_SPACE 250
- "POSTMASTER"
- .RECT AT (2513,6073)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (1139,0)(0,0)(0,273)(1139,273)(1139,0)
- .TXT AT (2813,6160)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- TXTXYOFF <-6 94>
- T_PNTS (0,94)(0,0)(527,0)(527,97)(0,97)(0,94)(527,94)
- .STR
- L_SPACE 250
- "SERVER"
- .ELL AT (2248,5774)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1 L_SPACE 139 MARGINS <69 69 139 34>
- PNTS (0,0)(119,0)(119,119)(0,119)(0,0)
- .LINE AT (2354,5834)
- PNTS (146,0)(0,0)
- .TXT AT (2779,6405)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 MARGINS <0 0 0 0>
- TXTXYOFF <-7 95>
- T_PNTS (0,95)(0,0)(599,0)(599,98)(0,98)(0,95)(599,95)
- .STR
- L_SPACE 250
- "server host"
-END .GRP
-.TXT AT (154,6070)
- L_SPACE 139
- TXTXYOFF <0 95>
- T_PNTS (0,95)(0,0)(1732,0)(1732,265)(0,265)(0,95)(1732,95)
- .STR
- L_SPACE 250
- "(d) frontend connected\n to multiple backend servers"
-.LINE AT (1513,1853)
- BACKFILL <1 0 0 0 0 0 0>
- THICKNESS 1 R_ARROW 3
- V_SPACE <0 250 0>
- SIZE 180000 MARGINS <125 125 250 62>
- PNTS (0,0)(747,46)
-.LINE AT (3079,1967)
- PNTS (0,0)(7,239)
-.LINE AT (1507,3166)
- PNTS (0,0)(993,418)
-.LINE AT (1491,5185)
- PNTS (0,0)(1027,1043)
-.LINE AT (1513,4923)
- PNTS (0,213)(993,0)
-.TXT AT (171,4321)
- BACKFILL <1 0 5 1000 0 0 0>
- THICKNESS 0 R_ARROW 0
- V_SPACE <0 139 0>
- SIZE 100000 L_SPACE 139 MARGINS <0 0 0 0>
- T_PNTS (0,95)(0,0)(1429,0)(1429,236)(0,236)(0,95)(1429,95)
- .STR
- L_SPACE 250
- "And multiple connections\ncan be established..."
-END PICTURE
-
-*END GRAPHICS
diff --git a/doc/src/graphics/connections.gif b/doc/src/graphics/connections.gif
deleted file mode 100644
index 0de39b8d8994440cacaeb4c4f976192c4ded5289..0000000000000000000000000000000000000000
Binary files a/doc/src/graphics/connections.gif and /dev/null differ