Comparison of FUV − NUV colour between the model-predicted star counts (solid line) and the UV-IR stars (solid circles) for the AIS fields towards the GC and the GAC (fields 5–6 in Table 1). The UV colours shown are for the stars with FUV< 20.0 mag, NUV< 20.5 mag, and the photometric errors < 0.2 (in both FUV and NUV bands). FUV − NUV colours of the model-predicted WDs and BHBs are shown by a dotted line and a long-dashed line, respectively. The UVIT (BaF2 − NUVB4) colour coverage is indicated by a dashed line.